Add Android instructions and bootstrap script

examples/android/example/README.md

@@ -0,0 +1,36 @@
+### Android example
+
+To compile example to shared library you will need [Android NDK](https://developer.android.com/ndk/downloads/index.html).
+To build Android apk you will need [Android SDK](http://developer.android.com/sdk/index.html#Other).
+Download and unpack archives somewhere.
+
+Go must be cross compiled for android. There is a bootstrap.sh script that you can use to compile Go and OpenAL for android/arm and android/arm64.
+
+Export path to Android NDK, point to location where you have unpacked archive:
+
+    export ANDROID_NDK_HOME=/opt/android-ndk
+
+Compile Go, OpenAL and android_native_app_glue, /usr/local is prefix where Go and Android toolchains will be installed:
+
+    ./bootstrap.sh /usr/local
+
+After build is complete point GOROOT to new Go installation in /usr/local, and add toolchain bin directory to PATH:
+
+    export GOROOT=/usr/local/go
+    export PATH=/usr/local/android-arm7/bin:${PATH}
+
+And compile shared library:
+
+    CGO_CFLAGS="-I/usr/local/android-arm7/include" CGO_LDFLAGS="-L/usr/local/android-arm7/lib" CC=arm-linux-androideabi-gcc CGO_ENABLED=1 GOOS=android GOARCH=arm \
+    ${GOROOT}/bin/go build -work -v -x -buildmode=c-shared -ldflags="-s -w -extldflags=-Wl,-soname,libexample.so" -o=android/libs/armeabi-v7a/libexample.so
+
+To build apk export path to Android SDK, point to location where you unpacked archive:
+
+    export ANDROID_HOME=/opt/android-sdk
+
+And build apk with ant:
+
+    cd android
+    ant clean debug
+
+If everything is successfully built apk can be found in bin/ directory.