Added Signin Backend

[kashnx]

Made backend for login. Kindly tell which pages to display after login and what before logging in.

Fixes: #88

Type of change

• [ ] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [ ] This change requires a documentation update

Checklist:

• [x] I have made this from my own
• [x] I have taken help from some online resourses
• [x] My code follows the style guidelines of this project
• [x] I have performed a self-review of my own code
• [x] I have commented my code, particularly in hard-to-understand areas
• [x] I have made corresponding changes to the documentation
• [x] My changes generate no new warnings

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[kashnx]

Hey, why havent you merged it?