Update README (add command for installing wasm on an ARM-based CPU, add SSH service startup command)

Signed-off-by: Doctor K <doctor_whoami@ghostchain.io>

README.md

@@ -56,6 +56,12 @@ an SSH server.
 sudo apt install openssh-server
 ```
 
+Start SSH Service using _systemctl_.
+
+```bash
+sudo systemctl start ssh
+```
+
 Enable SSH Service to Start on Boot: To ensure that the SSH service automatically
 starts after a reboot, you need to enable it using _systemctl_.