add blockec readme.md (#873)
add blockec readme.md (#873)


qiyuangong/SSM,PHILO-HE/SSM,qiyuangong/SSM,qiyuangong/SSM,qiyuangong/SSM,PHILO-HE/SSM,qiyuangong/SSM,PHILO-HE/SSM,qiyuangong/SSM,qiyuangong/SSM,PHILO-HE/SSM,PHILO-HE/SSM,PHILO-HE/SSM,PHILO-HE/SSM