info about headless container and ui

README.md

@@ -22,3 +22,23 @@
 * `abra app deploy <app-name>`
 
 For more, see [`docs.coopcloud.tech`](https://docs.coopcloud.tech).
+
+
+## Getting started using headscale 
+The recipe deploys two containers. 
+
+1. One is headscale itself. Note that it's a "distroless" container, so you can't enter with `bash` or `sh`, but you have to run the commands directly.
+
+> The headscale/headscale Docker container is based on a "distroless" image that does not contain a shell or any other debug tools. If you need to debug your application running in the Docker container, you can use the -debug variant, for example headscale/headscale:x.x.x-debug.
+> 
+> https://headscale.net/0.24.1/setup/install/container/#debugging-headscale-running-in-docker
+
+To run the command line do this:
+
+```bash
+abra app run yourapp.xyz app -- headscale help
+```
+
+2. The UI runs on `https://yourapp.xyz/web`, the UI is a mere frontend (a static site), so no data is saved on a server, so you will need to set URL and API-Key yourself on every client. Find more about the UI [here](https://github.com/gurucomputing/headscale-ui).
+
+For the usage of headscale itself, check the [offical docs](https://headscale.net/stable/usage/getting-started/).