Login using facebook functionality added

[piyusha2001]

🛠️ Fixes Issue #178

👨‍💻 Changes proposed

Added login using facebook functionality for user and worker sign up by using react-facebook-login npm library. You just have to enter your facebook api id by creating a app on https://developers.facebook.com/ .

✔️ Check List (Check all the applicable boxes)

• [x] My code follows the code style of this project.
• [x] This PR does not contain plagiarized content.
• [x] The title of my pull request is a short description of the requested changes.

📷 Screenshots

Working video-

https://user-images.githubusercontent.com/81703477/170874974-b4941853-4aa7-40ee-b66f-ae6414fe4637.mp4

[piyusha2001]

@KaizenGirl1111 please review this PR

[piyusha2001]

@KaizenGirl1111 please review this PR as today is last day for GSSoC contribution.