docs: add README for contributing

docs/README.md

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+# Go-fast CDN Documentation
+
+This is the documentation for the Go-fast CDN. If you want to edit the docs, you can checkout the [contribution guide](https://kevinanielsen.github.io/go-fast-cdn/contribution/contributing/).
+
+## Development
+
+The docs are built with [Starlight](https://starlight.astro.build/), an extension to [Astro](https://astro.build/).
+
+### Installation
+
+Use you favorite node package manager. We recommend pnpm, but others can be used as well.
+```bash
+pnpm install #installs the dependencies
+```
+
+### Developing
+
+```bash
+pnpm dev # runs the docs site in development mode on localhost
+```
+
+### Building
+
+```bash
+pnpm build #builds the site
+```