Add some messages.

app.py

@@ -33,6 +33,11 @@ async def webhook(req: Request):
 
     return data
 
+@app.get("/webhook")
+async def webhook_get():
+    return {"message": "/webhook for Telegram webhook is running. It accepts POST request from Telegram server."}
+
+
 def flip_text(x):
     return x[::-1]