update readme

README.md

images/HMM-sscocaller.PNG

images/hexsgcocaller1.png

images/sgcocaller_fig.png

private/blocks_utils.nim

private/cal_switch_score.nim

private/correctPhase.nim

private/findGtNodes.nim

private/findPath.nim

private/findTemplateCell.nim

private/fragments.nim

private/getGtMtx.nim

private/inferMissingSnps.nim

private/phase_blocks.nim

private/readfmf.nim

private/sgcocaller_sxo.nim

private/sgphase.nim

private/writeVCF.nim

sgcocaller.nim