Opensourcing RCTWrapper

Summary:
RCTWrapper is a library that allows turn any UIView/UIViewController-based widget into React Native component
which will respect layout constrains of native (wrapped) view.
So, you don't need to explicitly specify width and hight in styling.

Take a look at examples to see how to use RCTWrapper.

Reviewed By: mmmulani

Differential Revision: D5868763

fbshipit-source-id: 0a503b42be166d547ca6cbf0829eea9c75a8e364

Libraries/Wrapper/Example/RCTWrapperExampleViewController.m

@@ -0,0 +1,17 @@
+// Copyright 2004-present Facebook. All Rights Reserved.
+
+#import "RCTWrapperExampleViewController.h"
+
+#import <RCTWrapper/RCTWrapper.h>
+
+#import "RCTWrapperExampleView.h"
+
+@implementation RCTWrapperExampleViewController
+
+- (void)loadView {
+  self.view = [RCTWrapperExampleView new];
+}
+
+@end
+
+RCT_WRAPPER_FOR_VIEW_CONTROLLER(RCTWrapperExampleViewController)