Update README.md

Author: cheton

Diff for: README.md

@@ -2,18 +2,41 @@
 
 **Custom widget support is only available for CNCjs 1.9.10 or later versions**
 
-You can download a working example widget from the releases page:<br>
-https://github.com/cncjs/cncjs-widget-boilerplate/releases
-
-![image](https://user-images.githubusercontent.com/447801/30728983-b866f4b6-9f8e-11e7-9a90-6b712344d270.png)
-
 ## Installation
 
 ```bash
 npm i -g npm # Upgrade NPM to the latest version
 npm install
 ```
 
+## Development Guide
+
+Create a directory under <b>src/widgets</b> and put your code in there.
+
+```
+src/
+   widgets/
+      MyApp/index.js
+```
+
+When connecting to a local development server, you can specify the "widget" query parameter within your browser to switch between widgets (e.g. `http://localhost:5000/?widget=MyApp`).
+
+### Query Parameters
+
+Name | Description
+:--- | :----------
+token | (Required) An authentication token to enable secure communication. The token will be automatically set by CNCjs.
+host | (Optional) Specifies the host to connect to. Defaults to an empty string.
+widget | (Optional) Specifies a folder name under 'src/widgets'. Defaults to 'ReactApp'.
+
+### Examples
+
+#### React App
+
+There is a widget written with React, you can download it from the releases page: https://github.com/cncjs/cncjs-widget-boilerplate/releases
+
+![image](https://user-images.githubusercontent.com/447801/30728983-b866f4b6-9f8e-11e7-9a90-6b712344d270.png)
+
 ## Development
 
 Run `npm run dev` to start a local development server for development, then connect to http://localhost:5000 and wait until bundle finished.