Enhance README

[Akshayaqueen]

Hi Team! 👋

I’m excited to contribute to StackMate by improving the README documentation

✅ Proposed Fix:
● Fix minor typos and formatting inconsistencies for better readability.
● Adding 'Why StackMate' section
● Add a clear, concise flowchart illustrating the contribution workflow .
● Adding vision, mission and enhancing the readme
● Suggest additional minor improvements to the prerequisites and troubleshooting sections.

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🏷Labels Requested:
●hacktoberfest
●enhancement
●level1
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👉 Please assign this issue to me — I'll improve the README documentation.
Please let me know if there are any particular areas you'd like me to prioritize or if you have additional guidelines. Looking forward to collaborating and making StackMate even better! 🙌

Thank you for this wonderful open-source project!

[Vasu10134]

@Akshayaqueen i would like to work on this issue
kindly assign it to me!