Update README.md to address connection among chatqna, chathistory and prompt registry

Signed-off-by: Tsai, Louie <[email protected]>

Author: louie-tsai

ProductivitySuite/README.md

@@ -79,7 +79,7 @@ flowchart LR
     %% Questions interaction
     direction LR
     a[User Input Query] --> UI
-    UI --> GW_C
+    UI <--> |1 - get chatqna response| GW_C
     GW_C <==> ChatQnA-MegaService
     EM ==> RET
     RET ==> RER
@@ -130,15 +130,15 @@ flowchart LR
 
     %% Questions interaction
     direction LR
-    UI --> PR
+    UI --> |2 - register chatqna prompt | PR
   
     %% Embedding service flow
     direction LR
     PR <-.-> MDB
 
     %% Questions interaction
     direction LR
-    UI --> CH
+    UI --> |2 - save chatqna response| CH
   
     %% Embedding service flow
     direction LR