Add README and CONTRIBUTING documents to help users that are utilizin…

…g the github mirror rather than SVN.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/trunk@1798505 13f79535-47bb-0310-9956-ffa450edef68

CONTRIBUTING.md

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+# Contributing to Apache Tomcat
+
+Firstly, thanks for your interest in contributing! I hope that this will be a
+pleasant first experience for you, and that you will return to continue
+contributing.
+
+Please visit our [Get Involved page](http://tomcat.apache.org/getinvolved.html)
+for more information on how to contribute.
+
+## Code of Conduct
+
+This project and everyone participating in it is governed by the Apache
+software Foundation's
+[Code of Conduct](http://www.apache.org/foundation/policies/conduct.html). By
+participating, you are expected to adhere to this code. If you are aware of
+unacceptable behavior, please visit the
+[Reporting Guidelines page](http://www.apache.org/foundation/policies/conduct.html#reporting-guidelines)
+and follow the instructions there.
+
+## How Can I Contribute?
+
+Most of the contributions that we receive are code contributions, but you can
+also contribute to the documentation, wiki, etc., or simply report solid bugs
+for us to fix.
+
+### Reporting Bugs
+
+Please review our [guide](http://tomcat.apache.org/bugreport.html) on how to
+submit a bug report. This page also has links to other resources to assist
+you.
+
+### Your First Code Contribution
+
+### Trouble Deciding How to Contribute?
+
+Unsure where to begin contributing to Tomcat? You can start by taking a look at
+the issues marked 'Beginner', link below. Please note that the Beginner keyword
+is pretty new to the project, so if there aren't any issues in the filter feel
+free to ask on the [dev list](http://tomcat.apache.org/lists.html#tomcat-dev).
+
+* [Beginner issues](https://bz.apache.org/bugzilla/buglist.cgi?bug_status=NEW&bug_status=ASSIGNED&bug_status=REOPENED&bug_status=NEEDINFO&keywords=Beginner&keywords_type=allwords&list_id=160824&product=Tomcat%207&product=Tomcat%208&product=Tomcat%209&query_format=advanced) -
+issues which should only require a few lines of code, and a test or two to
+resolve.
+
+The list above shows all bugs that are marked 'Beginner' and are open in the
+currently supported Tomcat versions (7, 8, and 9).
+
+If you prefer C over Java, you may also take a look at the tomcat-native and
+Tomcat Connectors products in Bugzilla.
+
+### How to Provide Your First Patch
+
+Excited yet? This section will guide you through providing a patch to the
+committers of the project for review and acceptance.
+
+##### Chose Your Method of Submission
+
+You can provide a patch in one of the following ways (in order of preference):
+
+* Patch attachment to the Bugzilla issue
+* Github Pull Request
+> **Note:** Github is a mirror of the SVN repository that Tomcat is stored in
+and therefore it can't be merged outright. Your contribution will be converted
+into an SVN patch and committed with a mention of your name for credit.
+* Email the patch to the developer list. This is not preferred, but if no bug
+is associated with the patch, or you would like a developer review, an email
+may be appropriate.
+
+##### Get the Sources
+
+Now that you've chosen how you want to submit a patch, you need to get the
+source code.
+
+###### Download The Source Distribution
+
+This method works if you want to submit a patch (like you would do for SVN), but
+the difference in using the sources distribution and a VCS is that you have to
+manually generate the patch file by using diff. If this is what you want, you
+can download the sources from the "Source Code Distributions" section of the
+[Download Page](https://tomcat.apache.org/download-90.cgi).
+
+###### SVN
+
+If you have chosen to attach a patch to the Bugzilla issue (or email
+one), then you'll need to checkout the SVN version. Instructions for new
+committers to learn how to do this are found
+[here](http://www.apache.org/dev/contributors.html#svnbasics). However, in the
+interest of a fast ramp up, the short version is below. Note that the root of
+the SVN repository is
+[tomcat/trunk](http://svn.apache.org/repos/asf/tomcat/trunk),
+but you can clone specific versions too, such as
+[tc8.5.x](http://svn.apache.org/repos/asf/tomcat/tc8.5.x/trunk/) or even tags (
+[TOMCAT_8_5_15](http://svn.apache.org/repos/asf/tomcat/tc8.5.x/tags/TOMCAT_8_5_15/)).
+
+```
+$ svn co http://svn.apache.org/repos/asf/tomcat/trunk/
+```
+
+##### Github
+
+For Github, it's almost the same. Chose the major version that you want (for
+now they're in different repositories), fork the repository, and then clone
+your fork to do that work.
+
+```
+$ git clone https://github.com/$USERNAME/tomcat.git
+```
+
+#### Submitting Your Patch!
+
+After you've chosen your method of submission, retrieved the sources, and
+fixed the issue it's time to submit your work. At this point, just follow
+the method of submission you chose earlier.
+
+* Bugzilla attachment - attach the SVN patch to the Bugzilla issue
+* Github PR - after resolving the issue in your local fork and pushing to your
+copy of the repository, open a Github PR for review.
+* Email - again, not preferred, but you may send an email to the developer list
+with a patch attached for review.
+
+#### Waiting For Feedback
+
+It may take a while for committers to review. Please be patient during this
+time as all committers are volunteers on the project. If a significant amount
+of time has lapsed since your submission, such as a couple of months, feel free
+to either update your BZ, PR, or email the dev list with a message to bump your
+issue. Sometimes things get lost in all the work and we need a reminder :smile:
+
+## Style Guide
+
+Apache Tomcat has very loosely defined coding conventions, but the following
+guidelines will be useful:
+
+* Use spaces for indenting, not tabs
+* 100 char line width for Java source, 80 char line width for documentation
+source (.txt, .xml)
+* Java source: { at end of line, 4 space indents
+* XML source: 2 space indents
+
+## Did we miss something?
+
+Have you reviewed this guide and found it lacking? Or are you confused about
+some particular step? If so, please let us know! Or better yet, submit a PR to
+address the issue :wink:

README.md

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+## Welcome to Apache Tomcat!
+
+### What Is It?
+
+The Apache Tomcat® software is an open source implementation of the Java
+Servlet, JavaServer Pages, Java Expression Language and Java WebSocket
+technologies. The Java Servlet, JavaServer Pages, Java Expression Language and
+Java WebSocket specifications are developed under the
+[Java Community Process](http://jcp.org/en/introduction/overview).
+
+The Apache Tomcat software is developed in an open and participatory
+environment and released under the
+[Apache License version 2](http://www.apache.org/licenses/). The Apache Tomcat
+project is intended to be a collaboration of the best-of-breed developers from
+around the world. We invite you to participate in this open development
+project. To learn more about getting involved,
+[click here](http://tomcat.apache.org/getinvolved.html) or keep reading.
+
+Apache Tomcat software powers numerous large-scale, mission-critical web
+applications across a diverse range of industries and organizations. Some of
+these users and their stories are listed on the
+[PoweredBy wiki page](http://wiki.apache.org/tomcat/PoweredBy).
+
+Apache Tomcat, Tomcat, Apache, the Apache feather, and the Apache Tomcat
+project logo are trademarks of the Apache Software Foundation.
+
+### The Latest Version
+
+The current latest version in this branch (trunk) can be found on the [Tomcat 9.0](https://tomcat.apache.org/download-90.cgi) page.
+
+### Documentation
+
+The documentation available as of the date of this release is
+included in the docs webapp which ships with tomcat. You can access that webapp
+by starting tomcat and visiting http://localhost:8080/docs/ in your browser.
+The most up-to-date documentation can be found at
+http://tomcat.apache.org/tomcat-9.0-doc/.
+
+### Installation
+
+Please see RUNNING.txt for more info.
+
+### Licensing
+
+Please see LICENSE for more info.
+
+### Support and Mailing List Information
+
+* Free community support is available through the
+[tomcat-users](http://tomcat.apache.org/lists.html#tomcat-users) email list and
+a dedicated [IRC channel](http://tomcat.apache.org/irc.html) (#tomcat on
+Freenode).
+
+* If you want freely available support for running Apache Tomcat, please see the
+resources page [here](http://tomcat.apache.org/findhelp.html).
+
+* If you want to be informed about new code releases, bug fixes,
+security fixes, general news and information about Apache Tomcat, please
+subscribe to the
+[tomcat-announce](http://tomcat.apache.org/lists.html#tomcat-announce) email
+list.
+
+* If you have a concrete bug report for Apache Tomcat, please see the
+instructions for reporting a bug
+[here](http://tomcat.apache.org/bugreport.html).
+
+### Contributing
+
+Please see CONTRIBUTING for more info.