Added missing README files

Author: Bastien DAVID

android-16/README.md

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+# Android emulator API 16
+Run Android emulator with API 16
+
+## Built with
+- based on sofsam/android
+- Android API 16
+
+## Running the emulator
+Running the emulator for Android 16:
+
+    docker run -d --name android softsam/android-16
+
+The emulator exposes the port 5555 of ADB, and can be used by any other container (or the host).

android-base/README.md

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+# Android emulator base image
+Android base image for emulator, used to build images of emulators for the different SDKs.
+
+## Built with
+- latest debian
+- openjdk 7
+- Android SDK 24.3.3