Merge pull request #4804 from morenoh149/noteReadableMap

Add link to more info for ReadableMap and ReadableArray

docs/NativeModulesAndroid.md

@@ -86,6 +86,8 @@ ReadableMap -> Object
 ReadableArray -> Array
 ```
 
+Read more about [ReadableMap](https://github.com/facebook/react-native/blob/master/ReactAndroid/src/main/java/com/facebook/react/bridge/ReadableMap.java) and [ReadableArray](https://github.com/facebook/react-native/blob/master/ReactAndroid/src/main/java/com/facebook/react/bridge/ReadableArray.java)
+
 ### Register the Module
 
 The last step within Java is to register the Module; this happens in the `createNativeModules` of your apps package. If a module is not registered it will not be available from JavaScript.