Update README.MD

Author: clun

astra-shell/README.MD

@@ -294,9 +294,15 @@ The first execution is expected to be slow we are downloading cqlsh if not prese
 astra db cqlsh demo -v
 ```
 
-- Quit the `cqlshell` not forgetting the `;`
+- Run a cql command
 
+```sql
+describe keyspace demo;
 ```
+
+- Quit the `cqlshell` not forgetting the `;`
+
+```sql
 quit;
 ```