added building of the theora library

jni/libtheora-1.2.0alpha1/README.Android.md

@@ -0,0 +1,11 @@
+Building for Android should work using the ```config.h``` found in this
+directory. Should you need to recreate the ```config.h``` file due to an
+update of libtheora you have to do the following:
+
+1. Create the folders ```theora```, and ```theora/build```
+2. Extract the source of the theora library to ```theora/src```
+3. Copy the files ```ndkenv.sh``` and ```configure_android.sh``` to ```theora/build```
+4. Go to the ```theora/build``` directory and run ```configure_android.sh```
+
+You might have to adjust some paths and build settings in ```ndkenv.sh```
+and ```configure_android.sh```.