reSIProcate BasicMessage demo

reSIProcate is the premium open-source implementation of SIP, developed in first-class C++ by some of the authors of the IETF SIP RFC and leaders of various open source projects. This application demonstrates how to develop a basic SIP text messaging app on Android using the Android NDK and JNI. It can send and receive text messages through a SIP proxy server and it can interact with other SIP applications including the JsSIP web phone.