Initialise repository structure and placeholder files. Generic functionality works i guess, need to come up with a better solution for compose templates

host_vars/README.md

@@ -0,0 +1,7 @@
+# Host Variables
+
+Create one file per VM, for example `host_vars/media-01.yml`.
+
+Use host variables for hostnames, service enablement, storage paths, and port
+assignments. Keep credentials and TLS private material outside Git.
+