feat: add CONTRIBUTING file

CONTRIBUTING.md

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+# Contributing to [react-launchpad]
+
+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 Develop with Github
+
+We use GitHub to host code, to track issues and feature requests, as well as accept pull requests.
+
+## We Use Github Flow, So All Code Changes Happen Through Pull Requests
+
+Pull requests are the best way to propose changes to the codebase. We actively welcome your pull requests:
+
+1. Fork the repo and create your branch from `main`.
+2. If you've added code that should be tested, add tests.
+3. If you've changed APIs, update the documentation.
+4. Ensure the test suite passes.
+5. Make sure your code lints.
+6. Issue that pull request!
+
+## Any contributions you make will be under the Software License
+
+In short, when you submit code changes, your submissions are understood to be under the same MIT License that covers the project. Feel free to contact the maintainers if that's a concern.
+
+## Report bugs using Github's issues
+
+We use GitHub issues to track public bugs. Report a bug by opening a new issue; it's that easy!
+
+## Write bug reports with detail, background, and sample code
+
+[**Great Bug Reports**](https://www.bing.com/search?form=SKPBOT&q=Great%20Bug%20Reports) tend to have:
+
+•  A quick summary and/or background
+
+•  Steps to reproduce
+
+•  Be specific!
+
+•  Give sample code if you can.
+
+•  What you expected would happen
+
+•  What actually happens
+
+•  Notes (possibly including why you think this might be happening, or stuff you tried that didn't work)
+
+
+People *love* thorough bug reports.
+
+## Use a Consistent Coding Style
+
+* 2 spaces for indentation rather than tabs
+* You can try running `npm run lint` for style unification
+
+## License
+
+By contributing, you agree that your contributions will be licensed under its MIT License.
+
+## References
+
+This document was adapted from the open-source contribution guidelines for Facebook's Draft.