Simulate survival times
add_time(dt, eventObj, clinInt, clinExt, seed)a list of matrix containing simulated time-to-events information
a list of matrix generated in simu_cov containing simulated covariates information
an object of class .eventClass generated in set_event including event information
an object of class .clinClass generated in set_clin including internal trial information
an object of class .clinClass generated in set_clin including external trial information
the seed of R‘s random number generator. Default is the first element of .Random.seed