Add a note about the UIApp

README.md

@@ -14,6 +14,8 @@ Currently, the library provides testing replacements for:
 - [NSUserDefaults](#user-defaults)
 - [NSFileManager](#file-manager)
 - [View trait collections](#trait-collections)
+- [UIApplication](#uiapplication)
+
 
 These can be used with [Dependency Injection](#dependency-injection), or by using OCMock to replace global singletons.
 
@@ -76,6 +78,10 @@ You can stub the trait collections for `UIView` and `UIViewController`, the two
 [subject stubHorizontalSizeClass:UIUserInterfaceSizeClassRegular];
 ```
 
+### UIApplication
+
+Nothing to out of the normal here, you can create a `ForgeriesApplication` which is a UIApplication subclass for DI-ing a test. 
+
 ### Dependency Injection
 
 The trick is to use Forgeries in _testing only_. A great way to do this is via _Dependency Injection_. This means injecting a dependency into an instance, instead of having that instance create the dependency itself, or access shared state. Let's take a look at an example.