feat: Simple bluetooth status indication

Sources/scoobytag/BluetoothManager.swift

@@ -0,0 +1,23 @@
+import SwiftUI
+import CoreBluetooth
+
+final class BluetoothManager: NSObject, ObservableObject {
+    private var centralManager: CBCentralManager!
+	@Published var status = "Starting..."
+
+    override init() {
+        super.init()
+        centralManager = CBCentralManager(delegate: self, queue: nil)
+    }
+}
+
+extension BluetoothManager: CBCentralManagerDelegate {
+    func centralManagerDidUpdateState(_ central: CBCentralManager) {
+    switch central.state {
+    case .poweredOn:
+        status = "Bluetooth is on"
+    default:
+        status = "Bluetooth unavailable"
+    }
+}
+}