An iOS Demo for WKWebView supported mini-programs

0. Prerequisites: npm and xcode 10
1. cd into ZZeact folder first, and run npm start

• This will boot up the demo JS app on localhost:8081

2. open NativeKit.xcworkspace, and hit "Run"
3. On the TableView you see, pull down to reveal the mini-program drawer
4. Select the first icon, and you will see the content of localhost:8081.

• You can now verify the capabilities

1. JS app UI loaded in the screen
2. Message passing from JS app to native app

• Hit like button of the JS app, you will see that the native app navigation title change.
• Hit close button of the JS app, you will be able to navigate back in the native app.

3. Message passing from native app to JS app

• When like button of the JS app is hit, it triggers the native app to send a message to the JS app and change the document content.