Add README

unit/BasicNativeAndroidTest/README.md

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+# Basic sample for writing C/C++ GTest tests and running them on Android emulators / devices.
+
+This project uses the Gradle build system. You don't need an IDE to build and execute it but Android Studio is recommended.
+
+1. Download the project code, preferably using `git clone`.
+2. In Android Studio, select *File* | *Open...* and point to the `./build.gradle` file.
+3. Check out the relevant code:
+   * The C++ sources and tests are in `src/main/cpp`
+   * The device tests (which wrap the native tests) are in `src/androidTest/java`
+4. Create and run the Instrumented test configuration
+   * Open the `AdderTest` file, and click the run icon in the gutter, or
+   * Manually create a configuration.
+      * Open *Run* menu | *Edit Configurations*
+      * Add a new *Android Instrumented Tests* configuration
+      * Choose the `app` module
+      * Connect a device or start an emulator
+      * Run the newly created configuration
+
+If you are using Android Studio, the *Run* window will show the test results.