api documentation (#876)

* api documentation

* utoipa openapi docs generator

---------

Co-authored-by: Andrej Walilko <awalilko@liquidweb.com>

daemon/src/battery/mod.rs

@@ -18,9 +18,13 @@ pub mod wingtech;
 
 const LOW_BATTERY_LEVEL: u8 = 10;
 
+/// Device battery information
 #[derive(Clone, Copy, PartialEq, Debug, Serialize)]
+#[cfg_attr(feature = "apidocs", derive(utoipa::ToSchema))]
 pub struct BatteryState {
+    /// The current level in percentage of the device battery
     level: u8,
+    /// A boolean indicating whether the battery is currently being charged
     is_plugged_in: bool,
 }