feat: docs: add community articles

[maeste]

Description

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Fixes #<issue_number_goes_here> 🦕

[gemini-code-assist]

Summary of Changes

Hello @maeste, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a new documentation page to consolidate and make accessible a curated list of community-contributed articles and videos about Agent2Agent (A2A) concepts and the A2A Java SDK. The project's main README.md is updated to link to this new resource, significantly enhancing the project's documentation and resource accessibility for the community.

Highlights

• New Documentation File: A new markdown file, COMMUNITY_ARTICLES.md, has been added. This file serves as a centralized repository for external community articles and videos related to Agent2Agent (A2A) technology, categorized into general introductions and A2A Java SDK specifics.
• README Update for Discoverability: The main README.md file has been updated to include a new 'Community Articles' section. This section provides a direct link to the newly created COMMUNITY_ARTICLES.md, making these valuable external resources easily discoverable for users and contributors.

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[gemini-code-assist]

Code Review

This pull request adds a new documentation page listing community articles and videos, and links to it from the main README. The changes are a great addition to the project's documentation. I've left a couple of minor suggestions in COMMUNITY_ARTICLES.md to improve grammar and adhere to common file formatting standards. Overall, good work!