Add APIs

- AppRegistry
- AppState
- AsyncStorage
- Dimensions
- NativeMethods
- NetInfo
- PixelRatio
- Platform
- UIManager

docs/apis/NativeMethods.md

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+# NativeMethods
+
+React Native for Web provides several methods to directly access the underlying
+DOM node. This can be useful in cases when you want to focus a view or measure
+its on-screen dimensions, for example.
+
+The methods described are available on most of the default components provided
+by React Native for Web. Note, however, that they are *not* available on the
+composite components that you define in your own app. For more information, see
+[Direct Manipulation](../guides/direct-manipulation.md).
+
+## Methods
+
+**blur**()
+
+Removes focus from an input or view. This is the opposite of `focus()`.
+
+**focus**()
+
+Requests focus for the given input or view. The exact behavior triggered will
+depend the type of view.
+
+**measure**(callback: (x, y, width, height, pageX, pageY) => void)
+
+For a given view, `measure` determines the offset relative to the parent view,
+width, height, and the offset relative to the viewport. Returns the values via
+an async callback.
+
+Note that these measurements are not available until after the rendering has
+been completed.
+
+**measureLayout**(relativeToNativeNode: DOMNode, onSuccess: (x, y, width, height) => void)
+
+Like `measure`, but measures the view relative to another view, specified as
+`relativeToNativeNode`. This means that the returned `x`, `y` are relative to
+the origin `x`, `y` of the ancestor view.
+
+**setNativeProps**(nativeProps: Object)
+
+This function sends props straight to the underlying DOM node. See the [direct
+manipulation](../guides/direct-manipulation.md) guide for cases where
+`setNativeProps` should be used.