"Oauth with google, twitter & github added"

[Edasgh]

Closes: #352

• Title : The oauth buttons in login page doesn't work | Adding oauth in all the pages
• Name: Eshita Das
• Idenitfy yourself: GSSOC, Hacktoberfest contributor

###Changes

Files Created:

1. src/functions/useGoogleOauth.js
2. src/functions/useGithubOauth.js
3. src/functions/useXTwitterOauth.js

Files Changed:
1.src/pages/auth/Login.jsx
2. src/pages/auth/SignUp.jsx
3. src/App.jsx

Changes I made:

1. Imported oauth handlers in both "Login.jsx" and "SignUp.jsx" files from the hooks in the files : "useGoogleOauth.js" , "useGithubOauth.js", "useXTwitterOauth.js" & those handlers save the user-info & authorization token in localStorage
2. Added GoogleOAuthProvider in App.jsx
3. Defined googleAuth hook to get the access code from google in "api.js"
4. Added useEffect hooks in both "Login.jsx" and "SignUp.jsx" files to fetch the twitter user details

Type of change ☑️

• My code follows the code style of this project.
• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Code style update (formatting, local variables)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist: ☑️

• My code follows the code style of this project.
• My code follows the Contributing Guidelines & Code of Conduct of this project.
• This PR does not contain plagiarized content.
• I have performed a self-review of my own code.
• I have commented my code, particularly wherever it was hard to understand.
• My changes generate no new warnings.

Demo Video

https://www.loom.com/share/b4b5b067aa5c4b5a990448a8ce5ca0b0?sid=316b2cf0-4efb-4813-8c01-212965a2c7cf

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[Edasgh]

@Avdhesh-Varshney please check this PR