fix(headscale): some notes

Tools/Headscale.md

@@ -0,0 +1,32 @@
+# Headscale
+
+Headscale is a self-hosted, open source implementation of the Tailscale control server.
+
+
+## Connect a client to the server
+
+### Create a user
+
+In case you don't have a user yet, you can create one with the following command:
+
+```bash
+headscale users create <user>
+```
+
+### Get an authkey for the user
+
+```bash
+headscale --user <user> preauthkeys create --reusable --expiration 1h
+```
+
+### Authenticate tailscale client
+
+```bash
+tailscale up --login-server <headscale url> --authkey <authkey>
+```
+
+#### Check status
+
+```bash
+tailscale status
+```