Add httpbin in readme.md

README.md

@@ -150,6 +150,12 @@ All webhooks are disabled by default:
 - `WHATSAPP_HOOK_ONACK=http://localhost/uri`
 - `WHATSAPP_HOOK_ONADDEDTOGROUP=http://localhost/uri`
 
+If you want to look at the payload of the webhooks - use the url for that `https://httpbin.org/post`.
+
+```bash
+docker run -it -v `pwd`/tokens:/app/tokens --network=host -e WHATSAPP_HOOK_ONMESSAGE=https://httpbin.org/post allburov/whatsapp-http-api
+```
+
 ## File storage
 
 - `WHATSAPP_FILES_FOLDER` - folder where will be stored files from chats (images, voice messages) (