Added qtcbc description in README
Added qtcbc description in README

pet1330/strands_qsr_lib,cburbridge/strands_qsr_lib,yianni/strands_qsr_lib_rviz,Raziel90/strands_qsr_lib,yianni/rtd-dbg,strands-project/strands_qsr_lib,yianni/strands_qsr_lib,cdondrup/strands_qsr_lib,PDuckworth/strands_qsr_lib