Add beacon docs

docs/beacon.md

@@ -0,0 +1,19 @@
+# About Beacon and the information we collect
+
+To help us understand how Cachet is used, we collect anonymous usage data.
+
+If you'd prefer not to provide us with this anonymous usage data, please set `CACHET_BEACON` to `false` in your `.env` file.
+
+## Data collected by Beacon
+
+- `install_id` - a unique, anonymous installation ID
+- `version` - the version of Cachet being used
+- `docker` - whether Cachet is being ran from a Docker container
+- `database` - the database driver being used
+- `data.components` - the amount of configured Components
+- `data.incidents` - the amount of reported Incidents
+- `data.metrics` - the amount of configured Metrics
+- `data.users` - the amount of users
+- `data.actions` - the amount of actions performed
+- `data.tags` - the amount of Tags created
+- `data.schedules` - the amount of reported Schedules