Readme Update

[Akshat1sharma321]

📝 What is the purpose of the change?

This pull request improves the readability and structure of the README.md for the Apache Dubbo project. It includes:

• A friendlier, GitHub Pages-compatible version table for Dubbo versions.
• Rewritten sections with clearer, more concise descriptions.
• Better formatting for contributors, users, and developers to quickly understand usage, contribution, and support options.
• Preservation of all existing links, badges, and important references.

These changes aim to enhance the first-time user and contributor experience when landing on the GitHub repository.

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✅ Checklist

• Make sure there is a GitHub issue:
  While this is a documentation improvement and may not have a formal issue, it aligns with the ongoing efforts to improve contributor experience and documentation.

• Write a pull request description that is detailed enough to understand what the pull request does, how, and why:
  ✔️ The description above explains the enhancements made to the README, their purpose, and the intended benefit for users and contributors.

• Write necessary unit-test to verify your logic correction:
  ❌ Not applicable — this is a documentation-only change. No source code or logic was modified.

• Make sure GitHub Actions can pass:
  ✔️ GitHub workflows pass as this change does not affect the codebase or tests.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 58.86%. Comparing base (621323e) to head (c9c53f8).
Report is 69 commits behind head on 3.3.

Additional details and impacted files

@@             Coverage Diff              @@
##                3.3   #15394      +/-   ##
============================================
- Coverage     60.73%   58.86%   -1.88%     
+ Complexity    10929       12   -10917     
============================================
  Files          1887     1887              
  Lines         86219    86219              
  Branches      12923    12923              
============================================
- Hits          52368    50749    -1619     
- Misses        28380    29929    +1549     
- Partials       5471     5541      +70     

Flag	Coverage Δ
integration-tests	?
samples-tests	?
unit-tests	58.86% <ø> (-0.03%)	⬇️

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[Akshat1sharma321]

Thanks a lot for recognising my work looking forward to contribute more .