README.md: add instructions on how to build and install eSpeak for Android.

README.md

 
 This branch contains the files needed to build espeak on the android platform.
 It is derived from the eyes-free project.
+
+## Prerequisits
+
+To build eSpeak for Android, you need to have the following installed and
+configured correctly:
+
+1.  Android SDK
+2.  Android NDK
+3.  Eclipse
+4.  Android Developer Tools (ADT) for Eclipse
+
+## Building
+
+1.  Build the `libttsespeak.so` file by running:
+
+        $ ndk-build
+2.  Open Eclipse.
+3.  Create a new workspace.
+4.  Import the espeak folder as an exising Android project.
+5.  Build the espeak apk within Eclipse.
+
+## Installing
+
+The generated `eSpeakActivity.apk` can be installed like any other apk build
+via eclipse, such as by using the `Run` menu option.
+
+After running, `eSpeakActivity` will download the `espeak-data.zip` file. To
+enable eSpeak, you need to:
+
+1.  go into the Android `Text-to-Speech settings` UI;
+2.  enable `eSpeak TTS` in the `Engines` section;
+3.  select `eSpeak TTS` as the default engine;
+4.  use the `Listen to an example` option to check if everything is working.