Login app via Google acount

Hello friends,
I’m junior developer in ionic and I do maintenance for existing app.
For now users can login via facebook account only - how I add login via google mail account?
I use ionic v1.


Use the google plus login plugin.

Where I can find simple explanation how to install new plugin & config him?
Never did it before in ionic.


For installation and details refer to the link (ionic docs)
And for the explanation you can use Youtube and Google there are very good tutorials and explanations.

On Ionic v1, add the Google Sign-in plugin to your project: https://github.com/EddyVerbruggen/cordova-plugin-googleplus

You can then use it directly or through Ionic Native.