Added basic command line interface app.

src/main.rs

@@ -0,0 +1,19 @@
+use hyper_x_cloud_ii_wireless::Device;
+
+fn main() {
+    let device = match Device::new() {
+        Ok(device) => device,
+        Err(error) => {
+            eprintln!("{error}");
+            std::process::exit(1);
+        }
+    };
+    let (battery_level, charging) = match device.get_battery_level() {
+        Ok(t) => t,
+        Err(error) => {
+            eprintln!("{error}");
+            std::process::exit(1);
+        }
+    };
+    println!("Battery level: {}%", battery_level);
+}