new Chat Cordova sample

[DaveLomber]

This MR brings Chat Angular Web sample into Cordova env

Below is a guide how to run the new sample-chat-cordova sample:

Prerequisites

Make sure you have Cordova installed or install it via npm install -g cordova

Getting started

cd sample-chat-cordova

npm install   # do in only once

npm run install_dependencies   # do in only once
npm run config   # do in only once
npm run build   # do it every time when you change angular chat src code 

Then use the following commands to run the sample:

cordova clean android && cordova run android --device # for run on device
cordova clean android && cordova emulate android # for run on emulator

cordova clean ios && cordova run ios --device # for run on device
cordova clean ios && cordova emulate ios # for run on emulator