Update README.md

README.md

@@ -1,7 +1,7 @@
 # Solcast [[Home Assistant](https://www.home-assistant.io/) Component]
 This custom component integrates the Solcast API into Home Assistant.
 
-## Basic Installation/Configuration Instructions:
+## Basic Installation/Configuration Instructions
 Copy content of custom_components to your local custom_components folder and add the following lines to your configuration.
 
 #### Rooftop Site Configuration:
@@ -14,4 +14,32 @@ Rooftop site configuration variables:
 * **api_key**: Your API key from Solcast.
 * **resource_id**: The rooftop site resouce_id from Solcast.
 
-<hr>
+
+## Available service calls
+
+```yaml
+update_forecast:
+  description: >
+    Fetches the forecasts from Solcast.
+
+update_history:
+  description: >
+    Fetches historical data from Solcast.
+
+push_measurement:
+  desciption: >
+    Pushes PV measurements to Solcast for model fine tuning.
+  fields:
+    total_power:
+      desciption: >
+        The total power of the PV system for the given period.
+      example: 1.23456
+    period:
+      desciption: >
+        The period of the total power (e.g. PT5M, PT15M, PT30M, ...)
+      example: PT5M
+    period_end:
+      desciption: >
+        The end period of the total power in UTC timezone
+      example: 2018-02-02T03:30:00.0000000Z
+```