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CONTRIBUTING.md

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+# Contributing to SideStore
+
+Thank you for your interest in contributing to SideStore! SideStore is a community driven project, and it's made possible by people like you.
+
+There are many ways to contribute to SideStore, so if you aren't a developer, there are still many other ways you can help out:
+
+-   [Writing documentation](https://github.com/SideStore/SideStore-Docs)
+-   [Submitting detailed bug reports and suggesting new features](https://github.com/SideStore/SideStore/issues/new/choose)
+-   Helping out with support
+    -   [Discord](https://discord.gg/RgpFBX3Q3k)
+    -   [GitHub Discussions](https://github.com/SideStore/SideStore/discussions)
+
+However, this guide will focus on the development side of things. For now, we will only have setup information here, but you can [join our Discord](https://discord.gg/RgpFBX3Q3k) if you need help
+after setup.
+
+## Requirements
+
+This guide assumes you:
+
+-   are on a Mac
+-   have Xcode installed
+-   have basic command line knowledge (know how to run commands, cd into a directory)
+-   have basic Git knowledge ([GitHub Desktop](https://desktop.github.com) is a great tool for beginners, and greatly simplifies working with Git)
+-   have basic Swift/iOS development knowledge
+
+## Setup
+
+1. Fork the SideStore repo on GitHub.
+2. Clone the fork: `git clone https://github.com/<your github username>/SideStore.git --recurse-submodules`
+
+    If you are using GitHub Desktop, refer to
+    [this guide](https://docs.github.com/en/desktop/contributing-and-collaborating-using-github-desktop/adding-and-cloning-repositories/cloning-and-forking-repositories-from-github-desktop).
+
+3. Copy `CodeSigning.xcconfig.sample` to `CodeSigning.xcconfig` and fill in the values.
+4. **(Development only)** Change the value for `ALTDeviceID` in the Info.plist to your device's UDID. Normally, SideServer embeds the device's UDID in SideStore's Info.plist during installation. When
+   running through Xcode you'll need to set the value yourself or else SideStore won't resign (or even install) apps for the proper device. You can achieve this by changing a few things to be able to
+   build and use SideStore.
+5. Finally, open `AltStore.xcodeproj` in Xcode.
+
+Next, make and test your changes. Then, commit and push your changes using git and make a pull request.
+
+## Prebuilt binary information
+
+minimuxer (and soon em_proxy) uses prebuilt static library binaries built by GitHub Actions to speed up builds and remove the need for Rust to be installed when working on SideStore.
+[`Dependencies/fetch-prebuilt.sh`](./Dependencies/fetch-prebuilt.sh) will be run before each build by Xcode, and it will check if the downloaded binaries are up-to-date once every 6 hours. If you want
+to force it to check for new binaries, run `bash ./Dependencies/fetch-prebuilt.sh force`.
+
+## Building an IPA for distribution
+
+It is recommended to follow the build steps GitHub Actions uses: [`.github/workflows/stable.yml`](./.github/workflows/stable.yml) (in particular, the `Build SideStore`, `Fakesign app` and `Convert to IPA` build steps)
+
+## Developing minimuxer alongside SideStore
+
+Please see [minimuxer's README](https://github.com/SideStore/minimuxer) for development instructions.