update contrib

CONTRIBUTING.md

@@ -9,11 +9,10 @@ There are a few ways to contribute:
 - Submit Issues/Docs/Bugs ([Issues](https://github.com/voideditor/void/issues))
 
 
-## 2. Building the IDE
+## Building the full IDE
 
 Please follow the steps below to build the IDE. If you have any questions/issues, you can refer to VSCode's full [How to Contribute](https://github.com/microsoft/vscode/wiki/How-to-Contribute) page. Also feel free to [submit an issue](https://github.com/voideditor/void/issues/new) or get in touch with us with any build errors.
 
-<!-- TODO say whether you can build each distribution on any Operating System, or if you need to build Windows on Windows, etc -->
 
 ### a. Build Prerequisites - Mac
 
@@ -38,12 +37,17 @@ Finally, click Install.
 
 ### c. Build Prerequisites - Linux
 
-We haven't created prerequisite steps for building on Linux yet, but you can follow [How to Contribute](https://github.com/microsoft/vscode/wiki/How-to-Contribute).
+First, make sure you've installed NodeJS and run `npm install -g node-gyp`. Then:
+
+- Debian (Ubuntu, etc) - `sudo apt-get install build-essential g++ libx11-dev libxkbfile-dev libsecret-1-dev libkrb5-dev python-is-python3`.
+
+- Red Hat (Fedora, etc) - `sudo dnf install @development-tools gcc gcc-c++ make libsecret-devel krb5-devel libX11-devel libxkbfile-devel`.
+
+- Others - see [How to Contribute](https://github.com/microsoft/vscode/wiki/How-to-Contribute).
 
 ### Build instructions
 
 Before building Void, please follow the prerequisite steps above for your operating system. Also, make sure you've already built and compiled the Void React components by running `cd ./` (or just run `cd ./extensions/void && npm install && npm run build && npm run compile && cd ../..`).
-
 To build Void, first open `void/` in VSCode. Then:
 
 1. Install all dependencies.