Add GitHub Oauth Login and Registration

[codesankalp]

Description

As a developer, I need to implement GitHub sign on, so that I can allow GitHub users to login using their GitHub account.

For being able to use the application, the user has to create a new account and confirm the email just to log in. It's a long process. So by having GitHub OAuth we can make the process shorter for users who have a GitHub account.

Acceptance Criteria

Update [Required]

• [x] Implement GitHub OAuth login and registration

Definition of Done

• [ ] All of the required items are completed.
• [x] Approval by 1 mentor.

Linked Comment to this issue:

Yes, you can do that and build the feature full stack. Do create the issue and link to this comment of mine and to this issue. @codesankalp

Originally posted by @isabelcosta in https://github.com/anitab-org/open-source-programs-backend/issues/101#issuecomment-787446848

Estimation

8 hours