Adds CONTRIBUTING guidelines

CONTRIBUTING.md

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+# Contributing
+
+Pull requests are welcome, as long as they follow these simple guidelines:
+
+1. Links must be to the DOI, or the canonical reference page, if a DOI is not available. Prefer the original title as much as possible.
+1. Additional link to a pre-pub version (on ArXiv or elsewhere) is appreciated, but not required.
+1. Try to avoid low-information research (posters/presentations) unless the topic is not covered elsewhere in a better medium.
+1. You don't have to update the exported versions in your pull requests. (ie ignore the RDF/HTML/BibTeX files)
+
+Please note we have a code of conduct, please follow it in all your interactions with the project.
+
+## Change Process
+
+If you are comfortable with GitHub, you can send a pull request, or just send me a link:
+
+### Contact
+
+You can send us a link by [creating a new issue](https://github.com/captn3m0/boardgame-research/issues/new) on GitHub
+or [sending me an email](https://captnemo.in/contact/) with the details.
+
+### Pull Request Process
+
+0. Read the above guidelines.
+1. Click [here](https://github.com/captn3m0/boardgame-research/edit/master/README.md) to edit the README file. Make sure your changes abide by the guidelines.
+2. Add details about the game and link in the message and click "Propose changes".
+
+## 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, gender identity and expression, level of experience,
+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 <coc@captnemo.in>. 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 [http://contributor-covenant.org/version/1/4][version]
+
+[homepage]: http://contributor-covenant.org
+[version]: http://contributor-covenant.org/version/1/4/