Write initial README

site-cookbooks/kosmos_gitea/README.md

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 # kosmos_gitea
 
-TODO: Enter the cookbook description here.
+## Recipes
 
+### default
+
+Deploys the gitea binary, generates a config file and our custom Kosmos label
+set. The service runs as a Systemd unit.
+
+### backup
+
+Back up the `/var/lib/gitea` directory using the
+[backup](https://backup.github.io/backup/) tool and our backup cookbook
+
+### pg_db
+
+Should be executed on the primary PostgreSQL server (`postgresql_primary` role)
+to create the user, database and access rules