added codelab readmes (#267)

codelabs/digitclassifier/android/README.md

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+
+# MediaPipe Tasks Image Generation (basic) Codelab
+
+### Overview
+
+This directory contains the starting point and the finished version of an Android app that can be built through the official [MediaPipe Handwritten Digit Classifier](https://codelabs.developers.google.com/mp-digit-classifier-android) codelab.
+
+## Build the demo using Android Studio
+
+### Prerequisites
+
+*   The **[Android Studio](https://developer.android.com/studio/index.html)**
+    IDE. This sample has been tested on Android Studio Giraffe.
+
+*   A physical Android device with a minimum OS version of SDK 24 (Android 7.0 -
+    Nougat) with developer mode enabled. The process of enabling developer mode
+    may vary by device. You may also use an emulator for this codelab.
+
+### Building
+
+*   Open Android Studio. From the Welcome screen, select Open an existing
+    Android Studio project.
+
+*   From the Open File or Project window that appears, navigate to and select
+    the **start** directory if you are starting from the first step. If you
+     want to view the completed app, select the **finish** directory. Click OK.
+    You may be asked if you trust the project. Select Trust.
+
+*   If it asks you to do a Gradle Sync, click OK.
+
+*   With your Android device connected to your computer and developer mode
+    enabled, click on the green Run arrow in Android Studio.
+
+### Models used
+
+Downloading, extraction, and placing the models into the assets folder is managed
+automatically by the **download_models.gradle** file.

codelabs/image_generation_basic/android/README.md

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+
+# MediaPipe Tasks Image Generation (basic) Codelab
+
+### Overview
+
+This directory contains the starting point and the finished version of an Android app that can be built through the official [MediaPipe Image Generation](https://codelabs.devsite.corp.google.com/mp-image-generation-basic-android) codelab.
+
+
+## Build the demo using Android Studio
+
+### Prerequisites
+
+*   The **[Android Studio](https://developer.android.com/studio/index.html)**
+    IDE. This sample has been tested on Android Studio Giraffe.
+
+*   A physical Android device with a minimum OS version of SDK 24 (Android 7.0 -
+    Nougat) with developer mode enabled. The process of enabling developer mode
+    may vary by device. It is recommended that your device have at least 8GB of
+    memory
+
+### Building
+
+*   Open Android Studio. From the Welcome screen, select Open an existing
+    Android Studio project.
+
+*   From the Open File or Project window that appears, navigate to and select
+    the **start** directory if you are starting from the first step. If you
+     want to view the completed app, select the **finish** directory. Click OK.
+    You may be asked if you trust the project. Select Trust.
+
+*   If it asks you to do a Gradle Sync, click OK.
+
+*   With your Android device connected to your computer and developer mode
+    enabled, click on the green Run arrow in Android Studio.
+
+### Models used
+
+You can find the steps and process for copying the necessary model files to your device
+in the [official documentation](https://developers.google.com/mediapipe/solutions/vision/image_generator/android#model).