react-native-windows library

Summary:
This change adds the template for a RNW module to the existing react-native flipper project.

Basically, the changes in this diff are the product of executing the react-native-windows init for the existing library.

See:
https://microsoft.github.io/react-native-windows/docs/getting-started

https://microsoft.github.io/react-native-windows/docs/native-modules-setup

Notes:
There's some auto-generated module code contained in this change: ReactNativeModule (.h/.cpp)

allow-large-files

Reviewed By: passy

Differential Revision: D36751772

fbshipit-source-id: 41207bedb00ea147883f6d13336ed6c1da4454d7

react-native/react-native-flipper/windows/ReactNativeFlipper/ReactPackageProvider.idl

@@ -0,0 +1,9 @@
+namespace ReactNativeFlipper
+{
+    [webhosthidden]
+    [default_interface]
+    runtimeclass ReactPackageProvider : Microsoft.ReactNative.IReactPackageProvider
+    {
+        ReactPackageProvider();
+    };
+}