Add some comments

MvvmCross.Android.Support/V7.AppCompat/MvxAppCompatActivity.cs

@@ -87,6 +87,8 @@ namespace MvvmCross.Droid.Support.V7.AppCompat
         {
             base.OnCreate(bundle);
             ViewModel?.ViewCreated();
+
+            //TODO: Add setup init and startup here
         }
 
         protected override void OnDestroy()

MvvmCross/Platforms/Android/Views/MvxActivity.cs

@@ -115,6 +115,8 @@ namespace MvvmCross.Platforms.Android.Views
         {
             base.OnCreate(bundle);
             ViewModel?.ViewCreated();
+
+            //TODO: Add setup init and startup here
         }
 
         protected override void OnDestroy()