feat: docs: add community articles (#156)

# Description

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Fixes #<issue_number_goes_here> 🦕

---------

Co-authored-by: gemini-code-assist[bot] <176961590+gemini-code-assist[bot]@users.noreply.github.com>

Author: maeste

COMMUNITY_ARTICLES.md

@@ -0,0 +1,13 @@
+# Community Articles
+
+Here are some articles and videos from the community that you may find helpful.
+
+## General Agent and A2A Introduction
+
+*   [Agents are not tools](https://www.googlecloudcommunity.com/gc/Community-Blogs/Agents-are-not-tools/ba-p/922716): A nice explanation of what agents are from one of the main contributors of A2A spec.
+*   [Introducing A2A](https://goo.gle/a2a-video): A good video introducing A2A.
+
+## A2A Java SDK Specific
+
+*   [Quarkus and WildFly teams from Red Hat collaborating with Google on launch of Agent2Agent Java SDK](https://quarkus.io/blog/a2a-project-launches-java-sdk/): Announcing the new availability of the A2A Java SDK and giving a quick introduction to it. This article also appeared in the [Medium Google Cloud publication](https://medium.com/google-cloud/quarkus-and-wildfly-teams-from-red-hat-collaborating-with-google-on-launch-of-agent2agent-java-sdk-5f8cc64921cb).
+*   [A2A Java SDK Introduction Video](https://www.youtube.com/watch?v=5CZzW-wvEQs): A great video introducing the A2A Java SDK and giving a walkthrough of a multi-language interoperability example.

README.md

@@ -358,6 +358,10 @@ A complete example of a Python A2A client communicating with a Java A2A server i
 
 Check out the [example's README](examples/helloworld/server/README.md) for more information.
 
+## Community Articles
+
+See [COMMUNITY_ARTICLES.md](COMMUNITY_ARTICLES.md) for a list of community articles and videos.
+
 ## License
 
 This project is licensed under the terms of the [Apache 2.0 License](LICENSE).