Add documentation for Eastron virtual integration (#29147)

Co-authored-by: Franck Nijhof <frenck@frenck.nl>

source/_integrations/eastron.markdown

@@ -0,0 +1,20 @@
+---
+title: Eastron
+description: Integrate Eastron Wi-Fi energy meters using the HomeWizard integration.
+ha_category:
+  - Energy
+  - Sensor
+ha_domain: eastron
+ha_release: 2023.11
+ha_integration_type: virtual
+ha_supporting_domain: homewizard
+ha_supporting_integration: homewizard
+ha_codeowners:
+  - '@DCSBL'
+ha_config_flow: true
+ha_platforms:
+  - sensor
+ha_iot_class: Local Polling
+---
+
+{% include integrations/supported_brand.md %}