Add docs for Pure Energie integration (#21690)

source/_integrations/pure_energie.markdown

@@ -0,0 +1,39 @@
+---
+title: Pure Energie
+description: Instructions on how to integrate Pure Energie within Home Assistant.
+ha_category:
+  - Energy
+ha_release: 2022.3
+ha_iot_class: Local Polling
+ha_config_flow: true
+ha_codeowners:
+  - '@klaasnicolaas'
+ha_domain: pure_energie
+ha_platforms:
+  - sensor
+ha_quality_scale: platinum
+---
+
+The Pure Energie integration integrates the [Pure Energie Monitor](https://pure-energie.nl/kennisbank/pure-energie-meter/)
+device with Home Assistant.
+
+The Pure Energie meter is a product that allows you to read the data
+from your smart meter via the serial port (P1), such as your energy
+consumption and power flow.
+
+<div class='note'>
+The product of Pure Energie is a white label product of Net2Grid,
+other white label products may be found by zeroconf and work with
+this integration.
+</div>
+
+{% include integrations/config_flow.md %}
+
+### SmartBridge
+
+Read out what your meter readings are for energy consumption/production
+and see what your current power flow is.
+
+- Power Flow (W)
+- Energy Consumption (kWh)
+- Energy Production (kWh)