Add porting readme
Add porting readme


Former-commit-id: 3bd782f6711358e6594f99b41dc57d664e0b3d6a
ranxian/peloton,amaliujia/CMUDB-peloton,ranxian/peloton,amaliujia/CMUDB-peloton,omegaga/peloton,larryxiao/peloton-1,omegaga/peloton,larryxiao/peloton,larryxiao/peloton-1,larryxiao/peloton,amaliujia/CMUDB-peloton,ranxian/peloton,larryxiao/peloton,omegaga/peloton,larryxiao/peloton,larryxiao/peloton-1,larryxiao/peloton-1,omegaga/peloton,larryxiao/peloton,amaliujia/CMUDB-peloton,amaliujia/CMUDB-peloton,amaliujia/CMUDB-peloton,ranxian/peloton,larryxiao/peloton-1,larryxiao/peloton,larryxiao/peloton-1,ranxian/peloton,larryxiao/peloton,ranxian/peloton,omegaga/peloton,omegaga/peloton,omegaga/peloton,larryxiao/peloton-1,amaliujia/CMUDB-peloton