feat: add welcome endpoint for gradio2 returning a custom message

app.py

@@ -520,6 +520,11 @@ async def welcome() -> dict:
     return { "message": "Hello World"}
 
 
+@app.get("/gradio2")
+async def welcome() -> dict:
+    return { "message": "Hello gradio2"}
+
+
 # Mount Gradio app
 gradio_app = create_gradio_app()
 app = gr.mount_gradio_app(app, gradio_app, path="/gradio")