Documentation for griddy integration (#12312)

* Documentation for griddy integration

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source/_integrations/griddy.markdown

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+---
+title: Griddy
+description: Instructions on how to integrate griddy prices into Home Assistant.
+ha_category:
+  - Sensor
+ha_release: 0.107
+ha_iot_class: Cloud Polling
+ha_config_flow: true
+ha_codeowners:
+  - '@bdraco'
+ha_domain: griddy
+---
+
+The `griddy` integration allows you to integrate your [Griddy](https://griddy.com/) price data into Home Assistant.
+
+There is currently support for the following device types within Home Assistant:
+
+- Sensor
+
+## Configuration
+
+You will need your Griddy Load Zone to use this module.
+
+To add `Griddy` to your installation, go to **Configuration** >> **Integrations** in the UI, click the button with `+` sign and from the list of integrations select **Griddy**.
+
+Alternatively, add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+griddy:
+  loadzone: YOUR_LZ
+```
+
+{% configuration %}
+loadzone:
+  description: Your Load Zone is in your Griddy account under “Account > Meter > Load Zone.”
+  required: true
+  type: string
+{% endconfiguration %}
+
+### Sensor
+
+The current price for the Load Zone will appear as a sensor:
+
+- LZ_XXXXX Price Now
+
+### Example Automation
+
+```yaml
+- id: '1572630019168'
+  alias: Stop Tesla Charging if Power Price Spikes
+  description: ''
+  trigger:
+  - above: '30'
+    entity_id: sensor.lz_houston_price_now
+    platform: numeric_state
+  condition:
+  - condition: zone
+    entity_id: device_tracker.my_tesla
+    zone: zone.home
+  action:
+  - service: switch.turn_off
+    entity_id: switch.my_tesla_charger_switch
+```