Social media login

[gulyener]

User Story
As a social media user, I want to directly login to your website with my social media account, so that I don't have to fill in the register form and create a new account.

Plan for technical implementation

• Get a new firebase account and create app.
• To use firebase, configure each provider we want to use in their own developer app settings.
• In our Firebase app, enable facebook login by getting the App ID and an App Secret and enable Google login.

Frontend

• Install Firebase library to use the Firebase Authentication SDK.
• Create firebaseConfig file in client and initialize firebase app.
• Create actions for register success for social user and loaded social user .
• Create a new action creator to handle login/register from a social media account.

Backend

• Add a new route for social media login/register in routes/api/users.