Update README.md

Author: blackandred

README.md

@@ -2,3 +2,16 @@ RiotKit server tweaking starter
 ===============================
 
 Basic role to pre-configure RiotKit managed server.
+
+
+Default variables
+-----------------
+
+```yamlex
+remove_unattended_upgrades: yes
+remove_qemu_guest_agent: yes
+tune_docker: yes
+adjust_swappiness: yes
+
+swappiness: 10
+```