Create CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to _ygoprodeck-openapi_
+
+First, thank you for considering contributing to _ygoprodeck-openapi_ description.
+Together, we can improve the documentation of this public API to use it on downstream projects.
+
+#### Table Of Contents
+* [Code of conduct](#code-of-conduct)
+* [How to contribute](#how-to-contribute)
+* [Recognition model](#recognition-model)
+
+---
+
+## Code of conduct
+
+This project and everyone participating in it is governed by the [_ygoprodeck-openapi_ Code of Conduct][code_of_conduct].
+By participating, you are expected to uphold this code.
+Please report unacceptable behavior to [the Issue Tracker][issue_tracker].
+
+## How to contribute
+
+All contributions to _ygoprodeck-openapi- are welcome, either from users or developers.
+Contributions can be made in the form of [Issue Reports][issue_tracker] (for bug reports or feature requests)
+or [Pull Requests][pull_requests] (for code contributions).
+
+### Code contributions
+
+You should [make a fork](https://help.github.com/articles/fork-a-repo/) and [submit a Pull Request](https://help.github.com/articles/about-pull-requests/) to contribute.
+
+## Recognition model
+
+If you contribute to _ygoprodeck-openapi_ significantly (e.g., with a Pull Request), we would add your name to a `CONTRIBUTORS.md` file with details about your contribution(s).
+
+Currently we do not have any major contributor to the project. Be the first!
+
+[code_of_conduct]: https://github.com/magicDGS-gaming/ygoprodeck-openapi/blob/master/CODE_OF_CONDUCT.md
+[issue_tracker]: https://github.com/magicDGS-gaming/ygoprodeck-openapi/issues
+[pull_requests]: https://github.com/magicDGS-gaming/ygoprodeck-openapi/pulls