Create local_manifest.xml

TUTO simple Building CyanogenMod 10.1 based [Android 4.2.1] From source for all rk2918 with local_manifest.xml is link http://www.arctablet.com/blog/forum/arnova-g2-general-discussions/tuto-building-cyanogenmod-10-1-based-android-4-2-1-from-source-for-all-rk2918/