docs(adaptive rag): add mermaid diagram

resolve #5

Author: bsorrentino

adaptive-rag/README.md

@@ -4,6 +4,39 @@ Java implementation of [Adaptive Rag]
 
 [Adaptive Rag]:https://github.com/langchain-ai/langgraph/blob/main/examples/rag/langgraph_adaptive_rag.ipynb
 
+## Mermaid diagram
+
+```mermaid
+---
+title: Adaptive RAG
+---
+flowchart TD
+	start((start))
+	stop((stop))
+	web_search("web_search")
+	retrieve("retrieve")
+	grade_documents("grade_documents")
+	generate("generate")
+	transform_query("transform_query")
+	condition1{"check state"}
+	condition2{"check state"}
+	startcondition{"check state"}
+	start --> startcondition
+	startcondition -->|web_search| web_search
+	startcondition -->|vectorstore| retrieve
+	web_search --> generate
+	retrieve --> grade_documents
+	grade_documents --> condition1
+	condition1 -->|transform_query| transform_query
+	condition1 -->|generate| generate
+	transform_query --> retrieve
+	generate --> condition2
+	condition2 -->|not supported| generate
+	condition2 -->|not useful| transform_query
+	condition2 -->|useful| stop
+```
+
+## PlantUML diagram
 ![diagram](AdaptiveRag.png)
 
 ## Getting Started