perf: add deprecate notice for api2teams in README.md (#11797)

Co-authored-by: rentu <[email protected]>

packages/api2teams/README.md

@@ -1,5 +1,7 @@
 # Welcome to `api2teams`
-> The `api2teams` and its generated project template is currently under active development. Report any issues to us [here](https://github.com/OfficeDev/TeamsFx/issues/new/choose)
+
+> Deprecation Notice: this library has been deprecated and is no longer maintained or updated. 
+For continued support and enhanced features, we recommend [using the TTK to build a RAG bot in Teams](https://learn.microsoft.com/en-us/microsoftteams/platform/toolkit/build-a-rag-bot-in-teams). This will assist you in converting your Open API specification file into an AI chatbot.
 
 `api2teams` is a command line tool to generate a complete conversational style command and response [Teams application](https://learn.microsoft.com/microsoftteams/platform/bots/how-to/conversations/command-bot-in-teams) based on your Open API specification file and represent the API response in the form of [Adaptive Cards](https://learn.microsoft.com/microsoftteams/platform/task-modules-and-cards/cards/cards-reference#adaptive-card).
 

packages/api2teams/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@microsoft/api2teams",
-  "version": "0.1.1",
+  "version": "0.1.2",
   "description": "openapi spec to teams app",
   "main": "index.js",
   "author": "Microsoft Corporation",