Update README.md

README.md

@@ -14,6 +14,61 @@ You can install cs16.css simply by pasting this to your html `head` tag:
 
 or you can download css file and font from this repo. Inside css folder are prefixed and minified versions of cs16.css you can use.
 
+## Contributing
+
+Thank you for wanting to contribute to this project. Here you can learn how to do it.
+
+### Project structure
+
+```
+ArialPixel.ttf
+index.html
+package.json
+└── src
+    ├── cs16.css
+    ├── index.css
+    ├── main.js
+└── css
+    ├── cs16.css
+    ├── cs16.min.css
+```
+
+- `ArialPixel.ttf` - Main font.
+- `package.json` - Here you can find all installed packages as well as scripts for creating prefixed and minified versions of cs16.css.
+- `index.html`, `index.css`, `main.js` - Files for documentation page.
+- `src/cs16.css` -  Main cs16.css file. Edit this file if you want to change styling.
+- `css/cs16.css`, `css/cs16.min.css` -  Do not touch these files. These files are generated by `build:css` script from package.json.
+
+### Development
+
+#### Fork this repo
+
+You can fork this repo by clicking the fork button in the top right corner of the repo page.
+
+#### Clone on your machine
+
+```bash
+git clone https://github.com/your-username/cs16.css.git
+```
+
+#### Create a new branch
+
+```bash
+git checkout -b my-new-branch
+```
+
+#### Install dependencies
+
+```bash
+pnpm install
+```
+
+#### Build css/cs16.css and css/cs16.min.css
+
+```bash
+pnpm run build:css
+```
+
 ## License
 
 MIT