Wallbox documentation (related to HA PR 48082) (#17085)

* Wallbox documentation (related to HA PR 48082)

related to HA PR 48082 (https://github.com/home-assistant/core/pull/48082), documentation for new wallbox sensor component.

* Update wallbox.markdown

added ha_config_flow = true

* Update wallbox.markdown

added {% include integrations/config_flow.md %}

* Update source/_integrations/wallbox.markdown

changed based om comment from frenck

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

* Update source/_integrations/wallbox.markdown

changed based om comment from frenck

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

* Update wallbox.markdown

fixed spelling error after comment change

* Bump HA release

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

source/_integrations/wallbox.markdown

@@ -0,0 +1,32 @@
+---
+title: Wallbox
+description: Instructions on how to integrate sensors Wallbox EV chargers to Home Assistant
+ha_category:
+  - Car
+ha_release: 2021.6
+ha_iot_class: Cloud Polling
+ha_domain: wallbox
+ha_platforms:
+  - sensor
+ha_config_flow: true
+---
+
+The Wallbox integration pulls data from the [MyWallbox Portal](https://my.wallbox.com) for your Wallbox charging station.
+
+{% include integrations/config_flow.md %}
+
+## Sensors
+
+The integration adds the following sensors:
+
+- Added Energy
+- Added Range
+- Charging Power
+- Charging Speed
+- Charging Time
+- Cost
+- Current Mode
+- Depot Price
+- Max Available Power
+- State of Charge
+- Status Description