resolve #7 add init script

Author: raymondsze

packages/create-react-scripts/bin/create-react-scripts.js

@@ -1,4 +1,4 @@
 #!/usr/bin/env node
 "use strict";
 
-require('../index.js')();
+require('../index')();

packages/create-react-scripts/scripts/init.js

@@ -0,0 +1,10 @@
+'use strict'
+
+// Makes the script crash on unhandled rejections instead of silently
+// ignoring them. In the future, promise rejections that are not handled will
+// terminate the Node.js process with a non-zero exit code.
+process.on('unhandledRejection', err => {
+  throw err;
+});
+
+module.exports = require('react-scripts/scripts/init');