Add documentation for Sentry (#11625)

* Add documentation for Sentry

See also home-assistant/home-assistant#30422

* Fix YAML formatting

* Add ha_category, ha_iot_class

* Update category, add ha_release

* Remove optional params

Co-authored-by: Paulus Schoutsen <paulus@home-assistant.io>

source/_integrations/sentry.markdown

@@ -0,0 +1,32 @@
+---
+title: "Sentry"
+description: "Record errors to Sentry."
+logo: sentry.png
+ha_category:
+  - System Monitor
+ha_iot_class: Cloud Polling
+ha_release: 0.104
+---
+
+The `sentry` integration integrates with [Sentry](https://sentry.io/) to capture both logged errors as well as unhandled exceptions in Home Assistant.
+
+## Configuration
+
+To use the `sentry` integration in your installation, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+sentry:
+  dsn: SENTRY_DSN
+```
+
+{% configuration %}
+dsn:
+  description: The DSN provided to you by Sentry.
+  required: true
+  type: string
+environment:
+  description: An environment name to associate with events.
+  required: false
+  type: string
+{% endconfiguration %}