Add initial docs for ejabberd

doc/ejabberd.md

@@ -0,0 +1,17 @@
+# ejabberd
+
+The kosmos.org XMPP server is running on Andromeda
+
+[ejabberdctl reference](https://docs.ejabberd.im/admin/guide/managing/#ejabberdctl-commands)
+
+## Create a user account
+
+    sudo /opt/ejabberd-18.06/bin/ejabberdctl register username kosmos.org password
+
+## Change a user's password
+
+    sudo /opt/ejabberd-18.06/bin/ejabberdctl change_password username kosmos.org new_password
+
+## List users
+
+   sudo /opt/ejabberd-18.06/bin/ejabberdctl registered_users kosmos.org