Fully Responsive Tracker Expense Calculator Added.

[KiranAminPanjwani]

Description

• I have designed an easy-to-use expense calculator which will help user to calculate their monthly expenses.
• Users can maintain a record of their monthly expenses by saving them as cards.

Fixes #866

Type of change

• [X] New feature (non-breaking change which adds functionality)

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] I have commented my code, particularly in hard-to-understand areas
• [x] I have created a helpful and easy to understand README.md
• [x] I have made corresponding changes to the documentation
• [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

[KiranAminPanjwani]

@Ayush7614 Kindly review and merge it. Thank you.

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Legend

[KiranAminPanjwani]

@gurjeetsinghvirdee Thank you so much for merging it!✨

[KiranAminPanjwani]

@gurjeetsinghvirdee Thank you so much for merging it!✨

Kindly update the leaderboard 💥.

[gurjeetsinghvirdee]

@gurjeetsinghvirdee Thank you so much for merging it!✨

Kindly update the leaderboard 💥.

Leaderboard update itself with the help of Github action