Start contributing docs

.gitignore

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 !.gitignore
 !build.gradle
 !config.json
+!CONTRIBUTING.md
+!CONVENTIONS.md
 !gradle.properties
 !gradlew
 !gradlew.bat

CONTRIBUTING.md

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+# Contributing
+
+## Setup
+
+It's fairly simple to begin contributing Javadocs.
+
+### Prerequisites
+
+- You have an account on [GitHub](https://github.com), and know how to use basic GitHub functions such as Pull Requests.
+- You have basic knowledge of [git](https://docs.github.com/en/get-started/using-git/about-git) (such as what commits are, what branches are), and using it (cloning a repository, pushing, pulling). This guide assumes you are using the terminal/command line for git operations. If you are using a GUI for git, please consult that application's manual/user guide on how to do these operations.
+- You have access to a Chromium-based web browser. Annotater's editor makes use of the [Filesystem API](https://caniuse.com/filesystem), which is currently unsupported in Safari and Firefox based browsers.
+
+Before contributing documentation, please be sure to read our [naming conventions](./CONVENTIONS.md).
+
+### Steps
+
+1. **Fork the repository.** Forking the repository creates a copy of the repository (your _fork_) at your personal account, where you push your own commits to your branches.
+
+1. **Clone your forked repository locally.** The repository directory can have any name, by default cloning will make a directory with the same name as the repository.
+
+1. **Open mcsrc.dev and select the Settings gear icon in the top left, select Tools in the left sidebar, then click Open Annotater directory.** [mcsrc.dev](https://mcsrc.dev/) allows you to view the Minecraft source and add Javadocs. This will give the site permission to write to your local Annotater repository, making it far easier to contribute documentation
+
+1. **Write Javadocs.**
+    - Classes are listed at the left section of the interface, and a search bar is available in the top left. Click on a class to open it.
+    - To add Javadocs to a class, field, or method, click `Edit Javadoc` above the class, field, or method in question.
+    - Changes are saved automatically.
+
+1. **Commit and push your changes.** Once you're done making changes, save your work by committing it and pushing it to GitHub.
+
+1. **Open a Pull Request.** Pull Requests are reviewed and merged by our triage team, currently being assembled.