MERN Stack Login Methods (Hacktoberfest 2019)

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I want to create a project (using MERN Stack) which has most of the famous login authentication system.

I had created passport js implementaion of jwt,google,facebook.

Want to add more like github,twitter,instagram,reddit,etc.

Hactoberfest is great time for performing such task with open source contributors.

I welcomed everyone who can contribute here,

- tasks

- Documentation about this project
- React Client implentation for login 
- Added more and more login systems

Note: Do not add keys while pull request