detect nfc enabled

src/Android/Services/DeviceInfoService.cs

@@ -1,6 +1,6 @@
 using Android.App;
+using Android.Nfc;
 using Android.OS;
-using Android.Util;
 using Bit.App.Abstractions;
 
 namespace Bit.Android.Services
@@ -42,5 +42,14 @@ namespace Bit.Android.Services
                 return 1f;
             }
         }
+        public bool NfcEnabled
+        {
+            get
+            {
+                var manager = (NfcManager)Application.Context.GetSystemService("nfc");
+                var adapter = manager.DefaultAdapter;
+                return adapter != null && adapter.IsEnabled;
+            }
+        }
     }
 }

src/App/Abstractions/Services/IDeviceInfoService.cs

@@ -5,5 +5,6 @@
         string Model { get; }
         int Version { get; }
         float Scale { get; }
+        bool NfcEnabled { get; }
     }
 }

src/iOS.Core/Services/DeviceInfoService.cs

@@ -22,5 +22,6 @@ namespace Bit.iOS.Core.Services
             }
         }
         public float Scale => (float)UIScreen.MainScreen.Scale;
+        public bool NfcEnabled => false;
     }
 }