Add Starknet AI agent

Partially fixes keep-starknet-strange#126

Changes made: Adding Starknet AI agent

Reason to add it: This tool offers a way to expand their Starknet technical knowlegde using an AI agent, using Cairo Book and Starknet docs to provide answers.

README.md

@@ -91,6 +91,7 @@
 - [WTF Starknet](https://github.com/WTFAcademy/WTF-Starknet) - English and Chinese tutorials.
 - [Starknet Lesson](https://www.starknet-lesson.com) - The latest and best Cairo course classroom.
 - [Cairo Zero to Hero](https://www.youtube.com/playlist?list=PLAHFj7-3e6Lz_gSRsearGALkTduJZFdlt) - Introduction to Starknet and Cairo.
+- [Starknet AI agent](https://agent.starknet.id/) - Explore Starknet using an AI agent to enhance your learning and development.
 
 #### Articles and Blogs