Added google login backend route and integrated it with frontend

[ShwetKhatri2001]

Description

• User trying google signin/signup will be signed up and stored in database , if not done before , else will be logged in and previously stored / updated details will be fetched and shown on front-end.

Fixes #183

Type of Change:

• New Feature

How Has This Been Tested?

User is checked to be saved in database and being updated by checking edit profile / add new project. After every login previous data is being fetched correctly.

Checklist:

• [x] My PR follows the style guidelines of this project
• [x] I have performed a self-review of my own code or materials
• [x] I have commented my code or provided relevant documentation, particularly in hard-to-understand areas
• [x] My changes generate no new warnings
• [x] New and existing unit tests pass locally with my changes

[kanak22]

Kindly resolve the merge conflicts