Added documentation for growatt server integration. (#10032)

* Added documentation for growatt server integration.

* Apply suggestions from code review

Co-Authored-By: Klaas Schoute <klaas_schoute@hotmail.com>

* ✏️ Tweak

* Updated information.

source/_components/growatt_server.markdown

@@ -0,0 +1,64 @@
+---
+title: "Growatt server PV Inverter Sensor"
+description: "Instructions on how to integrate your Growatt server solar inverter within Home Assistant."
+logo: growatt.png
+ha_category:
+  - Sensor
+  - Energy
+ha_release: 0.99
+ha_iot_class: Cloud Polling
+---
+
+This is a sensor to collect information from your Growatt inverters using [Growatt server](https://server.growatt.com/).
+
+This will log into your Growatt account and grab the first "Plant", after which it collects the inverters on this plant and creates sensors for these inverters as well as total sensors.
+
+## Configuration
+
+Add the following to your `configuration.yaml` file:
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  - platform: growatt_server
+    username: GROWATT_SERVER_USERNAME
+    password: GROWATT_SERVER_PASSWORD
+```
+
+{% configuration %}
+username:
+  description: The username used to log into Growatt server.
+  required: true
+  type: string
+password:
+  description: The password used to log into Growatt server.
+  required: true
+  type: string
+plant_id:
+  description: The plant id to use in case you have multiple plants on your account.
+  required: false
+  type: integer
+  default: 0
+name:
+  description: Name of the sensor to use in the frontend.
+  required: false
+  default: Growatt
+  type: string
+{% endconfiguration %}
+
+## Example with multiple plants
+
+```yaml
+# Example configuration.yaml entry
+sensor:
+  - platform: growatt_server
+    name: 'growatt home'
+    plant_id: 12345678
+    username: username
+    password: password
+  - platform: growatt_server
+    name: 'growatt work'
+    plant_id: 87654321
+    username: username
+    password: password
+```