Keystatic: Improve docs

README.md

@@ -20,6 +20,13 @@ This project is build with [Astro](https://astro.build/), using `.astro` files w
 [![Open with CodeSandbox](https://assets.codesandbox.io/github/button-edit-lime.svg)](https://codesandbox.io/p/sandbox/github/withastro/astro/tree/latest/examples/blog)
 [![Open in GitHub Codespaces](https://github.com/codespaces/badge.svg)](https://codespaces.new/withastro/astro?devcontainer_path=.devcontainer/blog/devcontainer.json)
 
+### CMS
+
+We use [Keystatic](https://keystatic.com/) to edit some of the content.
+
+- CMS-Website – can only be used by user that have permissions to this Github repo
+- [Netlify-Backend for the CMS](https://app.netlify.com/sites/osm-verkehrswende-keystatic/overview) (Managed by @tordans)
+
 ### Add a new project
 
 - Create a new project folder in `/pages`