Signup using Google authentication

[aksuman055]

Currently signup is done by entering username and password, so to stop unauthorized access implement google authentication using college email id.

[Blakeinstein]

#9 Addresses this issue. @aksuman055 Can you also test signing up with google on prod? At least once Community-front-end also gets these changes..

[Blakeinstein]

We still need to have google login implemented. Currently adding our own oauth client.