Improve README with better formatting and features

[Mounikaishu]

Description -> Improved the README.md for the MyFinances project: -> Simplified structure for better readability -> Added emojis and modern formatting for visual appeal -> Updated Key Features section with clear icons -> Improved Getting Started instructions -> Updated Contributors Table section for clarity -> Added proper links for documentation and star history -> No new code functionality has been added; this is purely documentation improvement. Checklist -> Ran the Black Formatter and djLint-er on the README -> Made changes or additions to the documentation where required ->Changes generate no new warnings/errors ->New and existing unit tests are unaffected