Update README.md

tabvn · web-flow · commit 36afc940a16f · 2016-12-05T14:45:10.000+07:00
diff --git a/README.md b/README.md
@@ -3,6 +3,7 @@
 This project was generated with [angular-cli](https://github.com/angular/angular-cli) version 1.0.0-beta.20-4.
 
 ## Development server
+Run `npm install` to install all modules in package. then
 Run `ng serve` for a dev server. Navigate to `http://localhost:4200/`. The app will automatically reload if you change any of the source files.
 
 ## Code scaffolding
