Release React Native for Android

This is an early release and there are several things that are known
not to work if you're porting your iOS app to Android.

See the Known Issues guide on the website.

We will work with the community to reach platform parity with iOS.

ReactAndroid/src/main/java/com/facebook/react/bridge/ReadableMap.java

@@ -0,0 +1,28 @@
+/**
+ * Copyright (c) 2015-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ */
+
+package com.facebook.react.bridge;
+
+/**
+ * Interface for a map that allows typed access to its members. Used to pass parameters from JS to
+ * Java.
+ */
+public interface ReadableMap {
+
+  boolean hasKey(String name);
+  boolean isNull(String name);
+  boolean getBoolean(String name);
+  double getDouble(String name);
+  int getInt(String name);
+  String getString(String name);
+  ReadableArray getArray(String name);
+  ReadableMap getMap(String name);
+  ReadableType getType(String name);
+  ReadableMapKeySeyIterator keySetIterator();
+}