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

src/iOS.Core/Services/DeviceInfoService.cs

@@ -0,0 +1,25 @@
+using Bit.App.Abstractions;
+using UIKit;
+
+namespace Bit.iOS.Core.Services
+{
+    public class DeviceInfoService : IDeviceInfoService
+    {
+        public string Model => UIDevice.CurrentDevice.Model;
+        public int Version
+        {
+            get
+            {
+                int version;
+                var versionParts = UIDevice.CurrentDevice.SystemVersion.Split('.');
+                if(versionParts.Length > 0 && int.TryParse(versionParts[0], out version))
+                {
+                    return version;
+                }
+
+                // unable to determine version
+                return -1;
+            }
+        }
+    }
+}