Add service for body composition

Relates to https://github.com/cyberjunky/home-assistant-garmin_connect/issues/74

custom_components/garmin_connect/sensor.py

@@ -101,6 +101,9 @@ async def async_setup_entry(
         "set_active_gear", ENTITY_SERVICE_SCHEMA, coordinator.set_active_gear
     )
 
+    platform.async_register_entity_service(
+        "add_body_composition", BODY_COMPOSITION_SERVICE_SCHEMA, coordinator.add_body_composition
+    )
 
 ENTITY_SERVICE_SCHEMA = vol.Schema(
     {
@@ -110,6 +113,24 @@ ENTITY_SERVICE_SCHEMA = vol.Schema(
     }
 )
 
+BODY_COMPOSITION_SERVICE_SCHEMA = vol.Schema(
+    {
+        vol.Required(ATTR_ENTITY_ID): str,
+        vol.Optional("timestamp"): str,
+        vol.Required("weight"): float,
+        vol.Optional("percent_fat"): float,
+        vol.Optional("percent_hydration"): float,
+        vol.Optional("visceral_fat_mass"): float,
+        vol.Optional("bone_mass"): float,
+        vol.Optional("muscle_mass"): float,
+        vol.Optional("basal_met"): float,
+        vol.Optional("active_met"): float,
+        vol.Optional("physique_rating"): float,
+        vol.Optional("metabolic_age"): float,
+        vol.Optional("visceral_fat_rating"): float,
+        vol.Optional("bmi"): float
+    }
+)
 
 class GarminConnectSensor(CoordinatorEntity, SensorEntity):
     """Representation of a Garmin Connect Sensor."""