docs: Add contribution guidelines

CONTRIBUTING.md

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+<p align="center">
+  <picture>
+    <source
+      width="256px"
+      media="(prefers-color-scheme: dark)"
+      srcset="assets/revanced-headline/revanced-headline-vertical-dark.svg"
+    >
+    <img 
+      src="assets/revanced-headline/revanced-headline-vertical-light.svg"
+    >
+  </picture>
+  <br>
+  <a href="https://revanced.app/">
+       <img height="24px" src="assets/revanced-logo/revanced-logo-round.svg" />
+   </a>&nbsp;&nbsp;&nbsp;
+   <a href="https://github.com/revanced">
+       <picture>
+           <source height="24px" media="(prefers-color-scheme: dark)" srcset="https://i.ibb.co/dMMmCrW/Git-Hub-Mark.png" />
+           <img height="24px" src="https://i.ibb.co/9wV3HGF/Git-Hub-Mark-Light.png" />
+       </picture>
+   </a>&nbsp;&nbsp;&nbsp;
+   <a href="http://revanced.app/discord">
+       <img height="24px" src="https://user-images.githubusercontent.com/13122796/178032563-d4e084b7-244e-4358-af50-26bde6dd4996.png" />
+   </a>&nbsp;&nbsp;&nbsp;
+   <a href="https://reddit.com/r/revancedapp">
+       <img height="24px" src="https://user-images.githubusercontent.com/13122796/178032351-9d9d5619-8ef7-470a-9eec-2744ece54553.png" />
+   </a>&nbsp;&nbsp;&nbsp;
+   <a href="https://t.me/app_revanced">
+       <img height="24px" src="https://user-images.githubusercontent.com/13122796/178032213-faf25ab8-0bc3-4a94-a730-b524c96df124.png" />
+   </a>&nbsp;&nbsp;&nbsp;
+   <a href="https://twitter.com/revancedapp">
+       <img height="24px" src="https://user-images.githubusercontent.com/13122796/178032018-6da37214-7474-4641-a1da-7af7db3a31cd.png" />
+   </a>&nbsp;&nbsp;&nbsp;
+   <a href="https://www.youtube.com/@ReVanced">
+       <img height="24px" src="https://user-images.githubusercontent.com/13122796/178032714-c51c7492-0666-44ac-99c2-f003a695ab50.png" />
+   </a>&nbsp;&nbsp;&nbsp;
+   <br>
+   <br>
+   Continuing the legacy of Vanced
+</p>
+
+# 📙 ReVanced CLI contribution guidelines
+
+This document describes how to contribute to ReVanced CLI.
+
+## 📖 Resources to help you get started
+
+* The [documentation](/docs) explains how to use ReVanced CLI
+* [Our backlog](https://github.com/orgs/ReVanced/projects/12) is where we keep track of what we're working on
+* [Issues](https://github.com/ReVanced/revanced-cli/issues) are where we keep track of bugs and feature requests
+
+## 🙏 Submitting a feature request
+
+Features can be requested by opening an issue using the
+[Feature request issue template](https://github.com/ReVanced/revanced-cli/issues/new?assignees=&labels=Feature+request&projects=&template=feature-request.yml&title=feat%3A+).
+
+> **Note**
+> Requests can be accepted or rejected at the discretion of maintainers of ReVanced CLI.
+> Good motivation has to be provided for a request to be accepted.
+
+## 🐞 Submitting a bug report
+
+If you encounter a bug while using ReVanced CLI, open an issue using the
+[Bug report issue template](https://github.com/ReVanced/revanced-cli/issues/new?assignees=&labels=Bug+report&projects=&template=bug-report.yml&title=bug%3A+).
+
+## 📝 How to contribute
+
+1. Before contributing, it is recommended to open an issue to discuss your change
+   with the maintainers of ReVanced CLI. This will help you determine whether your change is acceptable
+   and whether it is worth your time to implement it
+2. Development happens on the `dev` branch. Fork the repository and create your branch from `dev`
+3. Commit your changes.
+4. Submit a pull request to the `dev` branch of the repository and reference issues
+   that your pull request closes in the description of your pull request
+5. Our team will review your pull request and provide feedback. Once your pull request is approved,
+   it will be merged into the `dev` branch and will be included in the next release of ReVanced CLI
+
+❤️ Thank you for considering contributing to ReVanced CLI,
+ReVanced