update contributing doc. Thanks to inspiration from Easy Digital Down…

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CONTRIBUTING.md

@@ -1,10 +1,14 @@
-### NOTE: The issues section is for bug reports and feature requests only.
+# Contributing to CMB2
+
+Thank you for your interest in contributing back to CMB2. Please help us review your issues and/or merge your pull requests by following the below guidelines.
+
+#### NOTE: The issues section is for bug reports and feature requests only.
 _Support is not offered for this library, and the likelihood that the maintainers will respond is very low. If you need help, please use [stackoverflow](http://stackoverflow.com/search?q=cmb), or the [wordpress.org plugin forums](http://wordpress.org/support/plugin/cmb2)._
 
 Before reporting a bug
 ---
-1. Search issue tracker for similar issues.
-2. Install the trunk version of CMB2.
+1. Search [issues](https://github.com/WebDevStudios/CMB2/issues) to see if the issue has been previously reported.
+2. Install the trunk version of CMB2 and test there.
 
 
 How to report a bug
@@ -24,6 +28,17 @@ All contributions welcome. If you would like to submit a pull request, please fo
 3. **Check out the trunk version of CMB2.** If you submit to the master branch, the PR will be closed with a link back to this document.
 4. **Verify your issue still exists in the trunk branch.**
 5. Make changes to your clone of the repository.
+	1. Please follow the [WordPress code standards](https://make.wordpress.org/core/handbook/coding-standards).
+	2. If possible, and if applicable, please also add/update unit tests for your changes.
+	3. Please add documentation to any new functions, methods, actions and filters.
+	4. When committing, reference your issue (if present) and include a note about the fix.
 6. [Submit a pull request](https://help.github.com/articles/creating-a-pull-request/).
 
 **Note:** You may gain more ground and avoid unecessary effort if you first open an issue with the proposed changes, but this step is not necessary.
+
+Additional Resources
+---
+* [CMB2 Snippet Library](https://github.com/WebDevStudios/CMB2-Snippet-Library)
+* [General GitHub Documentation](http://help.github.com/)
+* [GitHub Pull Request documentation](http://help.github.com/send-pull-requests/)
+* [PHPUnit Tests Guide](http://phpunit.de/manual/current/en/writing-tests-for-phpunit.html)