docs(README): Update usage to init from develop branch (#1092)

* docs(README): Update usage to init from develop branch

* docs(README): Add warning for init from develop

Author: sudo-suhas

README.md

@@ -21,6 +21,14 @@ $ npm install
 $ npm run dev
 ```
 
+This will scaffold the project using the `master` branch. If you wish to use the latest version of the webpack template, do the following instead:
+
+``` bash
+$ vue init webpack#develop my-project
+```
+
+:warning: **The develop branch is not considered stable and can contain bugs or not build at all, so use at your own risk.**
+
 The development server will run on port 8080 by default. If that port is already in use on your machine, the next free port will be used.
 
 ## What's Included