To run this application on browser, you just need to execute the following on your terminal.
Step 1: Download the source code & Extract anywhere you want. Then navigate to the project folder
cd chat npm install ionic serve
If you want to generate build, you can add platform & run. Note: you must have proper build environment to run the app.
ionic cordova platform add android ionic cordova build android ionic cordova run android ionic cordova platform add ios ionic cordova build ios ionic cordova run ios
Note: Generating ios app from windows is technically not possible. you need a Mac to run the app on iOS