docs: add CONTRIBUTING.md

CONTRIBUTING.md

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+# Contributing to top-issues-action
+
+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, track issues and feature requests, and accept pull requests.
+
+## We Use [Github Flow](https://guides.github.com/introduction/flow/index.html), So All Code Changes Happen Through Pull Requests
+
+Pull requests are the best way to propose changes to the codebase (we use [Github Flow](https://docs.github.com/en/get-started/quickstart/github-flow)). We actively welcome your pull requests:
+
+1.  Fork the repo and create your branch from `main`.
+2.  Create a new feature branch to implement your changes on.
+3.  Add tests if you've added code that should be tested.
+4.  If you've changed the internal working of the repository, update the documentation.
+5.  Ensure the test suite passes.
+6.  Make sure your code lints.
+7.  Issue that pull request!
+
+## Keep your fork updated
+
+As the [README](README.md) explains, this repository uses GitHub actions to create several derivative databases from the main databases. By default, the [create_db_derivatives.yaml](.github/workflows/create_db_derivatives.yaml) action that makes these derivative databases is disabled on forks. You therefore have to follow the following steps if you want this action to automatically generate the correct derivative databases on your fork:
+
+1.  Set the `CREATE_DERIVATIVES` repository variable to `true` in your repository settings (see [the GitHub documentation](https://docs.github.com/en/actions/learn-github-actions/variables#creating-configuration-variables-for-a-repository)).
+2.  Change the default `GITHUB_TOKEN` permissions to `Read and write permission` (see [the GitHub documentation](https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/enabling-features-for-your-repository/managing-github-actions-settings-for-a-repository#configuring-the-default-github_token-permissions)).
+
+## Report bugs using Github's [issues](https://github.com/rickstaa/top-issues-action/issues)
+
+[This is an example](http://stackoverflow.com/q/12488905/180626) of a bug report, and I think it's a good model. Here's [another example from Craig Hockenberry](http://www.openradar.me/11905408), an app developer greatly respected in the community.
+
+## Write bug reports with detail, background, and sample code
+
+[This is an example](http://stackoverflow.com/q/12488905/180626) of a bug report, and I think it's a good model. Here's [another example from Craig Hockenberry](http://www.openradar.me/11905408), an app developer greatly respected in the community.
+
+**Great Bug Reports** tend to have:
+
+-   A quick summary and/or background.
+-   Steps to reproduce:
+    -   Be specific!
+    -   Give sample code if you can. [A stackoverflow question](http://stackoverflow.com/q/12488905/180626) includes sample code that _anyone_ with a base R setup can run to reproduce the error.
+-   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. I'm not even kidding.
+
+## Use a Consistent Coding Style
+
+We use [black](https://github.com/psf/black) formatter to format our python code. You are advised to use [flake8](https://flake8.pycqa.org/en/latest/) for linting your code.
+
+## References
+
+This document was adapted from the open-source contribution guidelines for [Facebook's Draft](https://github.com/facebook/draft-js/blob/a9316a723f9e918afde44dea68b5f9f39b7d9b00/CONTRIBUTING.md).