Added Light theme in app

[jaivsh]

Description

I've added changes to the light theme and dark theme UI implementation and ensured that it functions.

Fixes #420

Have you read the Contributing Guidelines on Pull Requests?

• [x] Yes
• [ ] No

Type of change

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

Checklist:

• [x] My code follows the style guidelines(Clean Code) of this project
• [x] I have performed a self-review of my own code
• [x] My changes generate no new warnings
• [x] I have added tests/screenshots(if any) that prove my fix is effective or that my feature works.

[jaivsh]

@avinashkranjan please review this PR

[avinashkranjan]

Resolve the Conflicts..

[jaivsh]

Resolve the Conflicts..

@avinashkranjan sir, I've resolved the conflicts

[jaivsh]

@avinashkranjan please check sir