add start script

start.sh

@@ -0,0 +1,14 @@
+#!/bin/bash
+
+if [ "$NODE_ENV" == "production" ]; then
+    echo "Starting app in production mode"
+    echo "Running prebuild"
+    npm run prebuild
+    echo "Running build"
+    npm run build
+    echo "Starting app"
+    npm run start:prod
+else
+  echo "Starting app in development mode"
+  npm run start:dev
+fi