#169817542 Google and Facebook authentication

[gadishimwe]

What does this PR do?

Add Google and Facebook authentication feature

Description of Task to be completed?

• Add google authentication middleware and controller with passport
• Add facebook authentication middleware and controller with passport

How should this be manually tested?

$ git clone https://github.com/andela/the_spinners-backend.git
$ cd the_spinners-backend
$ git checkout  ft-login-with-google-facebook-auth-169817542
$ npm run dev

then visit this route in browser localhost:3000/api/auth/google for google and localhost:3000/api/auth/facebook for facebook
after that, you will be required to grant access to Barefoot Nomad and to sign in if you're currently not

What are the relevant pivotal tracker stories?

#169817542

Screenshots

[katunold]

LGTM