docs: update README.md

packages/api2teams/README.md

@@ -50,7 +50,11 @@ api2teams -v # show version information
 
 - Open the generated project in [Visual Studio Code](https://code.visualstudio.com/) and make sure you have the latest [Teams Toolkit](https://marketplace.visualstudio.com/items?itemName=TeamsDevApp.ms-teams-vscode-extension) (version 5.0.0 or higher) installed.
 
-- Follow the instruction provided in the `README.md` for the generated project to get started. For the Teams app converted by the given sample Open API spec, you will be able to run a `GET /pets/1` command in Teams and a bot will return an Adaptive Card as response.
+- Follow the instruction provided in the `README.md` for the generated project to get started. After installing the Teams app generated from the provided OpenAPI spec, you will receive a welcome message. 
+
+    ![welcome](https://github.com/OfficeDev/TeamsFx/wiki/api2teams/welcome.png)
+
+- You can then run a `GET /pets/1` command in Teams to receive an Adaptive Card response from the bot. 
 
     ![response](https://github.com/OfficeDev/TeamsFx/wiki/api2teams/workflow1.png)