Update index.md (#774)

Added a link to LLM quickstart

Author: dataprofessor

content/kb/tutorials/index.md

@@ -11,3 +11,4 @@ Our tutorials include step-by-step examples of building different types of apps
 - [Session State basics](/knowledge-base/tutorials/session-state)
 - [Deploy Streamlit apps](/knowledge-base/tutorials/deploy)
 - [Build conversational apps](/knowledge-base/tutorials/build-conversational-apps)
+- [LLM quickstart](/knowledge-base/tutorials/llm-quickstart)