Create CONTRIBUTING.md

Author: MoOx

CONTRIBUTING.md

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+# Contributing Guide to `@reason-react-native/__template__`
+
+We love your input! We want to make contributing to this project as easy and
+transparent as possible, whether it's:
+
+- Reporting a bug
+- Discussing the current state of the code
+- Submitting a fix
+- Proposing new features
+- Becoming a maintainer
+
+We use GitHub to
+
+- host code
+- track issues and feature requests
+- accept pull requests.
+- tag & publish release as well as pushing those to npm.
+
+## Reporting bugs or requesting a feature
+
+We use GitHub issues to track public bugs or discuss about new features. Please
+write bug reports or feature requests with detail, background, and sample code
+if necessary.
+
+Just try to
+[open a new issue](https://github.com/reason-react-native/__template__/issues/new/choose)
+& follow the instructions that should be prefilled for
+[bug](.github/ISSUE_TEMPLATE/bug.md) or
+[feature request](.github/ISSUE_TEMPLATE/feature.md).
+
+People _love_ thorough bug reports. Not even kidding.
+
+## Fixing bugs & implementing features
+
+We use [Github flow](https://guides.github.com/introduction/flow/index.html), so
+most code changes happen through Pull Requests.
+
+[Pull Requests](https://help.github.com/en/articles/about-pull-requests) are the
+best way to propose changes to the codebase since they notify watchers & allow
+contributors to discuss about changes.
+
+We actively welcome your pull requests.
+
+To make a pull request, you need to:
+
+1. [Fork the repo](https://help.github.com/en/articles/fork-a-repo)
+2. Clone it and install dependencies
+
+```console
+git clone https://github.com/reason-react-native/__template__
+cd __template__
+yarn
+```
+
+3. Create a local branch, from `master` (unless specified differently)
+
+```console
+git checkout -b <name-of-your-branch>
+```
+
+4. Add your changes!
+
+- If you've added code that should be tested, add tests.
+- If you've changed APIs, update the documentation.
+
+5. Ensure the everything is still fine.
+
+```console
+yarn test
+```
+
+6. Commit & push your branch online
+
+```console
+git add -A .
+git commit -m "Your commit message"
+```
+
+7. [Create a pull request](https://help.github.com/en/articles/creating-a-pull-request)
+
+_If you are new to Git or GitHub, we encourage you to have a look to
+[makeapullrequest.com](http://makeapullrequest.com)._
+
+## Code styling
+
+Everything as been automated: as soon as you commit, everything should be
+automatically reformated if necessary (thanks to a transparent git hook) so we
+don't have to think about it!
+
+## Licensing
+
+By contributing, you agree that your contributions will be licensed under our
+MIT License.
+
+When you submit code changes, your submissions are understood to be under the
+same [MIT License](./LICENSE) that covers the project. Feel free to contact the
+maintainers if that's a concern.