Add readme for mlkit android codelab

Author: Kalyan Reddy

mlkit-android/README.md

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+Codelabs for ML Kit for Firebase
+============
+
+This repository contains two codelabs for ML Kit for Firebase:
+* Recognize text in images with ML Kit for Firebase
+* Identify objects in images using custom machine learning models with ML Kit for Firebase
+
+Introduction
+------------
+In these codelabs, you will build an Android app that uses various features
+of ML Kit for Firebase to recognize text and identify objects in images. You
+will learn how to use both the built in on-device and cloud Text Recognition APIs
+and how to use your own Tensor Flow Lite custom models with ML Kit.
+
+Pre-requisites
+--------------
+None.
+
+Getting Started
+---------------
+Open the `final/` folder in each respective codelab in Android Studio to see the final product.
+Visit the Google codelabs site to follow along the guided steps.
+
+Screenshots
+-----------
+
+Support
+-------
+
+- Stack Overflow: http://stackoverflow.com/questions/tagged/mlkit
+
+If you've found an error in this sample, please file an issue:
+https://github.com/googlecodelabs/ml-kit/issues
+
+Patches are encouraged, and may be submitted by forking this project and
+submitting a pull request through GitHub.
+
+License
+-------
+
+Copyright 2018 Google, Inc.
+
+Licensed to the Apache Software Foundation (ASF) under one or more contributor
+license agreements.  See the NOTICE file distributed with this work for
+additional information regarding copyright ownership.  The ASF licenses this
+file to you under the Apache License, Version 2.0 (the "License"); you may not
+use this file except in compliance with the License.  You may obtain a copy of
+the License at
+
+  http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.  See the
+License for the specific language governing permissions and limitations under
+the License.