update readme

Readme.md

@@ -1,8 +1,52 @@
-### About
+# GCT Generator
+
 This repository contains the code behind the Super Mario Sunshine Cheatfile Generator at https://gct.zint.ch/
 
 ---
-### Features
-* Custom cheat combination
-* Custom stage loader based on [QbeRoot's fastcodes](https://github.com/QbeRoot/fastcodes)
-* Creates cheatfiles ready for use with [Nintendont](https://github.com/FIX94/Nintendont), [Gecko Cheat Manager](https://wiibrew.org/wiki/CheatManager) and [Dolphin](https://github.com/dolphin-emu/dolphin)
+
+## Features
+
+- Custom cheat combination
+- Custom stage loader based on [QbeRoot's fastcodes](https://github.com/QbeRoot/fastcodes)
+- Creates cheatfiles ready for use with [Nintendont](https://github.com/FIX94/Nintendont), [Gecko Cheat Manager](https://wiibrew.org/wiki/CheatManager) and [Dolphin](https://github.com/dolphin-emu/dolphin)
+
+---
+
+## Contributing
+
+### Updating Practice Codes
+
+The codes are stored as XML files (one for each game version) in the [docs/.vuepress/public/codes](https://github.com/BitPatty/gctGenerator/tree/master/docs/.vuepress/public/codes) directory. If you want to add or change codes edit the corresponding XML file. Node that GMSJ0A refers to the NTSC-J 1.1 release of Super Mario Sunshine. (It's not actually called version A but that's what we've been calling it for years due to a misconception on what the A on the back of the box means).
+
+### Updating Guides
+
+You can find the guides in the [docs](https://github.com/BitPatty/gctGenerator/tree/master/docs) folder. Simply edit the corresponding markdown file (.md).
+
+### Site Development
+
+If you intend to change site code you need [NodeJS](https://nodejs.org/en/) version 12.18.1 or greater installed on your local.
+
+```sh
+# Install yarn
+npm i -g yarn
+
+# Install dependencies
+yarn
+
+# Run project in watch mode
+# This will serve the page in development mode on http://localhost:8080
+yarn dev
+
+# Build project
+yarn build
+```
+
+### Build and preview the site (Docker)
+
+The project root provides a [docker-compose](https://docs.docker.com/compose/) file, which creates a clean build (with the same configuration as the production build) and spins up a minimal Apache server on your local, serving the resulting build on port 8080.
+
+```sh
+# Build and serve the site on http://localhost:8080
+# Press CTRL+C to stop the container
+docker-compose up --build
+```