updated usage page to NDK
updated usage page to NDK

simpligility/android-ndk-maven-plugin,simpligility/android-ndk-maven-plugin,kedzie/android-ndk-maven-plugin,kedzie/android-ndk-maven-plugin,lpalonek/android-ndk-maven-plugin,lpalonek/android-ndk-maven-plugin,simpligility/android-ndk-maven-plugin