Add shutdown command (#74)

Author: salvador-barboza

.devcontainer/refreshTools.sh

@@ -38,6 +38,7 @@ sudo mv ./spark-sdk-dist/server.js /usr/local/bin/spark-server
 sudo mv ./spark-sdk-dist/designer.js /usr/local/bin/spark-designer
 sudo mv ./spark-sdk-dist/upload-to-remote.sh /usr/local/bin/upload-to-remote.sh
 sudo mv ./spark-sdk-dist/deploy.sh /usr/local/bin/deploy.sh
+sudo mv ./spark-sdk-dist/shutdown.sh /usr/local/bin/shutdown.sh
 sudo mv ./spark-sdk-dist/hydrate.sh /usr/local/bin/hydrate.sh
 sudo mv ./spark-sdk-dist/file-syncer.js /usr/local/bin/spark-file-syncer
 sudo mv ./spark-sdk-dist/spark-agent.js /usr/local/bin/spark-agent
@@ -78,4 +79,4 @@ rm -rf $TEMP_DIR
 # Update marker file with latest release ID
 echo "$RELEASE_ID" | sudo tee "$RELEASE_MARKER_FILE" > /dev/null
 
-echo "Tools installed successfully."
+echo "Tools installed successfully."