Add documentation for Huisbaasje integration (#15678)

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

source/_integrations/huisbaasje.markdown

@@ -0,0 +1,35 @@
+---
+title: Huisbaasje
+description: Instructions on how to integrate Huisbaasje with Home Assistant.
+ha_category:
+  - Sensor
+  - Energy
+ha_release: 2021.2
+ha_iot_class: Cloud Polling
+ha_config_flow: true
+ha_codeowners:
+  - '@denniss17'
+ha_domain: huisbaasje
+---
+
+The Huisbaasje integrations allows you to track your energy consumption collected
+by the monitoring device installed on your energy meters.
+
+## Configuration
+
+Menu: **Configuration** -> **Integrations**.
+
+Click on the `+` sign to add an integration and click on **Huisbaasje**.
+Log in using your Huisbaasje account. After finishing, the Huisbaasje integration
+will be available.
+
+## Sensors
+
+This integration provides the following sensors:
+
+- Current power usage
+- Current power consumption from the grid, for both normal and off-peak time periods.
+- Current power return to the grid, for both normal and off-peak time periods.
+- Total energy used today
+- Current gas usage
+- Total gas used today