Added custom device info service for determining model and version (ios = major version, android = API level).

src/Android/Services/DeviceInfoService.cs

@@ -0,0 +1,11 @@
+using Android.OS;
+using Bit.App.Abstractions;
+
+namespace Bit.Android.Services
+{
+    public class DeviceInfoService : IDeviceInfoService
+    {
+        public string Model => Build.Model;
+        public int Version => (int)Build.VERSION.SdkInt;
+    }
+}