Enhance README: Shields to capture the attention of potential contributors

[devactivity-team]

I noticed you have opened issues labeled help wanted. I recommend enhancing the README to make the call for new contributors more prominent.

Changes Made:

1. Shields: Added Shields.io badges at the top of the README

[![GitHub repo Good Issues for newbies](https://img.shields.io/github/issues/apache/eventmesh/good%20first%20issue?style=flat&logo=github&logoColor=green&label=Good%20First%20issues)](https://github.com/apache/eventmesh/issues?q=is%3Aopen+is%3Aissue+label%3A%22good+first+issue%22) [![GitHub Help Wanted issues](https://img.shields.io/github/issues/apache/eventmesh/help%20wanted?style=flat&logo=github&logoColor=b545d1&label=%22Help%20Wanted%22%20issues)](https://github.com/apache/eventmesh/issues?q=is%3Aopen+is%3Aissue+label%3A%22help+wanted%22) [![GitHub Help Wanted PRs](https://img.shields.io/github/issues-pr/apache/eventmesh/help%20wanted?style=flat&logo=github&logoColor=b545d1&label=%22Help%20Wanted%22%20PRs)](https://github.com/apache/eventmesh/pulls?q=is%3Aopen+is%3Aissue+label%3A%22help+wanted%22) [![GitHub repo Issues](https://img.shields.io/github/issues/apache/eventmesh?style=flat&logo=github&logoColor=red&label=Issues)](https://github.com/apache/eventmesh/issues?q=is%3Aopen)

Why This Matters:

• Attract New Contributors: Considering there is a number of opened issues labeled 'Help Wanted' - a welcoming and appealing README is one of the most efficient ways to attract new contributors

Additional Resources:

For more insights into building a strong open-source community, check out the Building Community guide.

🚀 Thank you for considering this pull request! 🚀

[devactivity-team]

I also suggest enhancing the README with the following widgets using devActivity app:

Repo Stats

Feel free to explore the Live Demo and Public Dashboard for a quick overview of the app.
It makes the contribution process more exciting with gamification elements like:

• 🌟 XP and Levels based on contributions
• 🏆 Challenges and Achievements
• 🏅 Leaderboard and much more!

Latest repositories using devActivity: barecheck (⭐55)

---

Simply install an app to bring a more comprehensive and engaging community experience.

🌟 Happy Coding! 🌟

[github-actions]

Welcome to the Apache EventMesh community!!
This is your first PR in our project. We're very excited to have you onboard contributing. Your contributions are greatly appreciated!

Please make sure that the changes are covered by tests.
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[github-actions]

It has been 60 days since the last activity on this pull request. I am reaching out here to gently remind you that the Apache EventMesh community values every pull request, and please feel free to get in touch with the reviewers at any time. They are available to assist you in advancing the progress of your pull request and offering the latest feedback.

If you encounter any challenges during development, seeking support within the community is encouraged. We sincerely appreciate your contributions to Apache EventMesh.