Update README.md

Author: vetripandi

README.md

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 # chat-app-using-firebase-and-angularjs
 AngularJS allows for maintenance of your chat apps. That is because when you need to add new features to your Angular application. It's a breeze wiith the upcoming Angular 2 framework the level of abstraction used to simplify your application development will make your life easy as the developer.
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+A Desktop based Chat app with node-webkit, Firebase and Angularjs
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+Tutorial : [Building a Chat App with node-webkit, Firebase, and AngularJS]
+https://github.com/vetripandi/chat-app-using-firebase-and-angularjs
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+Follow the Steps to run the Chat Application
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+Open command prompt
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+npm install
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+node app
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+Then open localhost:3000
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