createBasininstantiates an object from class of createBasin
# S3 method for default
createBasin(name = "Untittled", simulation=list(start=NULL,end=NULL,by=NULL))a string: a name for the basin
a list of simulation time and dates as below:
start: the date which simulation starts, must be in 'YYYY-MM-DD' format
start: the date which simulation ends, must be in 'YYYY-MM-DD' format
by: the interval of each steps in seconds
a list: an object from class of creatBasin