Add contributors info

README.md

@@ -26,6 +26,9 @@ There is a video tutorial available [here](https://www.youtube.com/watch?v=dQw4w
 
 ## Contributing
 
+If you want to contribute to SteamDepotDownloaderGUI, please make sure to follow
+the [contributing instructions and guidelines](contributing.md).
+
 Pull requests are welcome. For major changes, please open an issue first to discuss what you would like to change.
 
 Please make sure to keep code consistent and cross-platform compatible.

contributing.md

@@ -0,0 +1,61 @@
+# SteamDepotDownloaderGUI development information
+
+SteamDepotDownloaderGUI is a graphical user interface for DepotDownloader.
+
+It is written in Node.js and uses the [electron](https://electronjs.org/) framework.
+The CSS framework is [Primer](https://primer.style).
+
+## Setup development environment
+
+**Note that these instructions may differ from operating system to operating system.**
+
+* Install node.js, npm, and git on your computer.
+
+* Clone the repository.
+
+```bash
+git clone https://github.com/mmvanheusden/SteamDepotDownloaderGUI
+```
+
+* Move into the directory and install npm dependencies.
+
+```bash
+cd SteamDepotDownloaderGUI
+npm install
+```
+
+* **You are now ready to contribute**
+
+## Testing the application
+
+```bash
+npm start
+```
+
+## Building the application
+
+```bash
+npm run build
+```
+
+* If you are using macOS, you may build using the following command:
+
+```bash
+npm run buildall
+```
+
+This will build the application for all supported operating systems.
+
+## Contributing Guidelines
+
+Please make sure to keep code consistent and cross-platform compatible.
+
+After you made a change, clean-up the code using your favorite code editor and run the following command:
+
+```bash
+npx eslint *.js --fix
+```
+
+Please make sure your git commit message is descriptive and contains the changes you made.
+
+**Happy coding!**