Add readme, license, and contributing docs

CONTRIBUTING.md

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+# New Contributor's Survival Guide
+
+This document details the steps and other important information on how to contribute to FreshPresence. Feel free to skip sections if you believe you're already set.
+
+## Requirements:
+- Basic knowledge of [Zig](https://ziglang.org/)
+- Basic knowledge of the Discord RPC API
+
+## Software prerequisites
+- [Zig](https://ziglang.org)
+- [Git](https://git-scm.com)
+- Any text editor
+
+# Preparing your system
+In order to use Git you must set up your configuration, this should ideally match your GitHub account's name and email. 
+
+You can use [GitHub Desktop](https://desktop.github.com) or the IDE of your choice to help you with this! **Or if you're more technically inclined**, follow the CLI instructions below.
+
+This will modify the **global** config, which will allow you to contribute to multiple projects with the same name and email with ease.
+
+`$ git config --global user.name Your Name`
+
+`$ git config --global user.email [email protected]`
+
+# Preparing your new development environment
+It's almost time to clone FreshPresence! Create a fork by pressing the "Fork" button at the base of this repository.
+
+Afterwards, open a terminal to your working directory and clone the new fork using Git.
+
+This is usually done with the following command: 
+`$ [email protected]:<YOUR_USERNAME>/FreshPresence.git`
+
+Now, open the folder/workspace/solution with the IDE you chose. Explore the codebase, experiment, and have fun!
+
+To run the software in **DEBUG** mode, simply write: 
+`$ zig build run -- https://REFRESHINSTANCE/ USERNAME`
+
+To compile for a specific platform, you can append `-Dtarget=TARGET` to the build invocation, eg. `zig build -Dtarget=x86_64-linux`
+
+To compile a release build, you can append `-Doptimize=ReleaseSmall`. the possible options are `Debug`, `ReleaseSmall`, `ReleaseFast`, `ReleaseSafe`. Our builds are compiled with ReleaseSmall, but for test builds Debug or ReleaseSafe are preferred!
+
+Make sure to add [the upstream FreshPresence repository](https://github.com/LittleBigRefresh/FreshPresence) as the "**upstream**" remote using your IDE or GitHub Desktop. Happy hunting!
+
+### Follow up in the patching documentation for connecting using your choice of device, TBW