Add analytics-event documentation

README.md

@@ -38,6 +38,7 @@ the version number in its `package.json` is higher than the version number on np
 | `entry-point-url`             | Entry point url for all api requests                                              |
 | `requested-login-status`      | Used by the login buttons to trigger a login in auth components                   |
 | `initial-file-handling-state` | Used by the file-handling component to sync file source/sink at first time open   |
+| `analytics-event`             | Used to send analytics events to the Matomo component                             |
 
 ## Reserved events
 

packages/matomo/README.md

@@ -23,6 +23,20 @@ npm i @dbp-toolkit/matomo
   - example auth property: `{'login-status': 'logged-in'}`
   - note: most often this should be an attribute that is not set directly, but subscribed at a provider
 
+### Emitted attributes
+
+The component emits a `dbp-set-property` event for the `analytics-event` attribute.
+It looks like this:
+
+```json
+{
+  "category": "the category of the event",
+  "action": "the action of the event",
+  "name": "the name of the event",
+  "value": "the value of the event"
+}
+```
+
 ## Tracking actions
 
 ```html