Add notes about logging to the README

README.md

@@ -151,6 +151,15 @@ As an Engine, we avoid all the standard Rails middleware. That's nice for simpli
 Rails.application.config.twirp.middleware = [Rack::Deflater]
 ```
 
+### Logging
+
+Our built-in logging outputs the result of each request. Additionally, you can output the Twirp object to help with debugging: 
+
+```ruby
+# Defaults to true if your log_level is :debug
+Rails.application.config.twirp.verbose_logging = true
+```
+
 ## Bonus Features
 
 Outside the [Twirp spec](https://twitchtv.github.io/twirp/docs/spec_v7.html), we have some (optional) extra magic. They might be useful to you, but you can easily ignore them too.