update README

README.md

@@ -1,12 +1,19 @@
 # GitOps for tbrnt k3s hosting
 
+## Repo structure
+
+* Each subdirectory is a namespace
+* `_apps` is the meta directory for Argo CD apps
+* Another private repo contains stuff in a more
+  approachable format, f.e. for dealing with
+  updating sealed-secrets: `gitops-tbrnt-private`
 
 ## k3s on Alpine
 
 * Install k3s: `apk add k3s cni-plugins iptables`
 * Enable cgroups: `rc-update add cgroups default`
 * Adapt service file `/etc/init.d/k3s`:
-  ```
+```
 #!/sbin/openrc-run
 
 export PATH=/usr/share/cni-plugins/bin:$PATH