fix(readme): more mods (#4)

README.md

@@ -15,6 +15,13 @@ Axelar Network is a work in progress. At no point in time should you transfer an
   + https://hub.docker.com/repository/docker/axelarnet/axelar-core
   + https://hub.docker.com/repository/docker/axelarnet/tofnd
 
+## Useful commands
+Axelar node runs in two containers (one with the core consensus engine and another with threshold crypto process). You can stop/remove all your containers using: 
+```
+docker stop $(docker ps -a -q)
+docker rm $(docker ps -a -q)
+```
+
 ## What you need
 - Bitcoin testnet faucet to send some test BTC: https://testnet-faucet.mempool.co/
 - Metamask