#174864453 builds user up/in using Facebook OAuth

[Augusta-E]

What does this PR do

• This PR enables User to signup and sign in with Facebook OAuth feature

Description of tasks to be completed?

• Install necessary dependencies
• Write a program to signup and sign in a user using Facebook oauth
• Test program to ensure the user is signed up, and can also sign in successfully

How should this be manually tested/checked?

• Clone the PR
• Checkout to the branch ft-facebook-user-singup/in-oauth-174864453
• Install the dependencies using npm install
• Start the server by running npm run dev
• Create a .env file and define the following as follows:
  • DEV_DATABASE_URL = <development database url>
  • TEST_DATABASE_URL = <test database url>
  • DATABASE_URL = <production database url>
  • go to .gitignore file, copy the 'facebook signup details' and past it in your .env file
  • To test this feature go to http://localhost:3000/api/v1/auth/facebook on your browser.

What are the relevant pivotal tracker stories?

#174864453