Update README to mention RAG course and add complementary description

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Co-Authored-By: Claude <[email protected]>

Author: omarsar

README.md

@@ -10,7 +10,9 @@ Motivated by the high interest in developing with LLMs, we have created this new
 
 🌐 [Prompt Engineering Guide (Web Version)](https://www.promptingguide.ai/)
 
-🎉 We are excited to launch our brand new prompt engineering and AI Agent courses under the DAIR.AI Academy. [Join Now](https://dair-ai.thinkific.com/bundles/pro)!
+🎉 We are excited to launch our new prompt engineering, RAG, and AI Agents courses under the DAIR.AI Academy. [Join Now](https://dair-ai.thinkific.com/bundles/pro)!
+
+The courses are meant to compliment this guide and provide a more hands-on approach to learning about prompt engineering, context engineering, and AI Agents. 
 
 Use code PROMPTING20 to get an extra 20% off.