Improve the CLI document and add step to confirm cleanup (#213)

Author: tungbq

README.md

@@ -39,11 +39,13 @@ sudo mv devops-toolkit-cli /usr/local/bin/
 Navigate to your workspace folder, then:
 
 - Initialize the docker image, container and configuration directory:
+  - If you already init before and want to re-init in new workspace, run `devops-toolkit-cli cleanup` before initialization.
 
 ```bash
 devops-toolkit-cli init
 # Run 'devops-toolkit-cli init vX.Y.Z' if you want to use specific version.
 # E.g: devops-toolkit-cli init 1.0.2
+
 ```
 
 - Start a shell in new container:

devops-toolkit-cli

@@ -93,6 +93,11 @@ exec_in_container() {
 }
 
 cleanup() {
+    read -p "Are you sure you want to remove the container '$CONTAINER_NAME'? Type 'yes' to confirm: " confirmation
+    if [ "$confirmation" != "yes" ]; then
+        log $YELLOW "Cleanup aborted."
+        return
+    fi
     log $BLUE "Cleaning up..."
     if docker inspect --type=container "$CONTAINER_NAME" > /dev/null 2>&1; then
         docker stop "$CONTAINER_NAME" > /dev/null