Create CODE_OF_CONDUCT.md (omnideconv#50)

* Create CODE_OF_CONDUCT.md

* Create CONTRIBUTING.md

CODE_OF_CONDUCT.md

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+# Contributor Covenant Code of Conduct
+
+## Our Pledge
+
+In the interest of fostering an open and welcoming environment, we as
+contributors and maintainers pledge to making participation in our project and
+our community a harassment-free experience for everyone, regardless of age, body
+size, disability, ethnicity, sex characteristics, gender identity and expression,
+level of experience, education, socio-economic status, nationality, personal
+appearance, race, religion, or sexual identity and orientation.
+
+## Our Standards
+
+Examples of behavior that contributes to creating a positive environment
+include:
+
+* Using welcoming and inclusive language
+* Being respectful of differing viewpoints and experiences
+* Gracefully accepting constructive criticism
+* Focusing on what is best for the community
+* Showing empathy towards other community members
+
+Examples of unacceptable behavior by participants include:
+
+* The use of sexualized language or imagery and unwelcome sexual attention or
+ advances
+* Trolling, insulting/derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or electronic
+ address, without explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+ professional setting
+
+## Our Responsibilities
+
+Project maintainers are responsible for clarifying the standards of acceptable
+behavior and are expected to take appropriate and fair corrective action in
+response to any instances of unacceptable behavior.
+
+Project maintainers have the right and responsibility to remove, edit, or
+reject comments, commits, code, wiki edits, issues, and other contributions
+that are not aligned to this Code of Conduct, or to ban temporarily or
+permanently any contributor for other behaviors that they deem inappropriate,
+threatening, offensive, or harmful.
+
+## Scope
+
+This Code of Conduct applies both within project spaces and in public spaces
+when an individual is representing the project or its community. Examples of
+representing a project or community include using an official project e-mail
+address, posting via an official social media account, or acting as an appointed
+representative at an online or offline event. Representation of a project may be
+further defined and clarified by project maintainers.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported by contacting the project team at [email protected]. All
+complaints will be reviewed and investigated and will result in a response that
+is deemed necessary and appropriate to the circumstances. The project team is
+obligated to maintain confidentiality with regard to the reporter of an incident.
+Further details of specific enforcement policies may be posted separately.
+
+Project maintainers who do not follow or enforce the Code of Conduct in good
+faith may face temporary or permanent repercussions as determined by other
+members of the project's leadership.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant][homepage], version 1.4,
+available at https://www.contributor-covenant.org/version/1/4/code-of-conduct.html
+
+[homepage]: https://www.contributor-covenant.org
+
+For answers to common questions about this code of conduct, see
+https://www.contributor-covenant.org/faq

CONTRIBUTING.md

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+# Contributing
+
+We welcome contributions to immunedeconv!
+
+## Filing an issue
+
+Bug reports and feature requests are indispensible for improving immunedeconv. To make them as useful as possible: 
+
+* Search the repository to see if someone has already reported the same issue.
+  This allows contributors to spend less time responding to issues, and more time adding new features!
+* Please provide a minimal complete verifiable example for any bug.
+  If you're not sure what this means, check out
+  [this blog post](http://matthewrocklin.com/blog/work/2018/02/28/minimal-bug-reports)
+  by Matthew Rocklin or [this definition](https://stackoverflow.com/help/mcve) from StackOverflow.
+* Let us know about your environment. Environment information is available via `sessionInfo()`.
+
+## Contributing code
+
+We are absolutely enthusiastic about code contributions! If you prepare a PR, we'd like you to follow 
+the following guidelines: 
+
+### Tests
+Please write tests! We use [`testthat`](https://testthat.r-lib.org/) to ensure the package works correctly. 
+You can refer to the [existing test suite](https://github.com/icbi-lab/immunedeconv/tree/master/tests)
+and the [Testing chapter from the R packages book](http://r-pkgs.had.co.nz/tests.html) when adding new tests. 
+
+### Documentation
+When adding a new function, make sure you write appropriate documentation. We make use 
+of [roxygen2](https://cran.r-project.org/web/packages/roxygen2/vignettes/roxygen2.html) to 
+document functions and [pkgdown](https://pkgdown.r-lib.org/) to render the documentation website. 
+
+ * The roxygen2 docstring should describe what the function is doing (try to think about it from 
+   the prespective of the user).
+ * The docstring should describe all parameters and return values.
+ * Consider adding an example to one of the [vignettes](https://github.com/icbi-lab/immunedeconv/tree/master/vignettes).