Allow to lower the feedback level per application

We munge the application id the same way as it's done
for notifications so these can eventually move into
the same schema.

README.md

@@ -126,6 +126,15 @@ Run feedbacks for event `message-new-instant` for 10 seconds:
 _build/cli/fbcli -t 10 -E alarm-clock-elapsed
 ```
 
+## Per app profiles
+One can lower the feedback level of an individual application
+via `GSettings`. E.g. for an app with app id `sm.puri.Phosh`
+to set the profile to `quiet` do:
+
+```
+GSETTINGS_SCHEMA_DIR=_build/data/ gsettings set org.sigxcpu.feedbackd.application:/org/sigxcpu/feedbackd/application/sm-puri-phosh/ profile quiet
+```
+
 # Documentation
 
 - [Libfeedback API](https://honk.sigxcpu.org/projects/feedbackd/doc/)