Signature	Description	Parameters
*template<typename T> std::vector<typename T> & create_column(const char name);**	It creates an empty column named “name” Returns a reference to the vector for that column. If a column with the same name and type already exists, it retunrs a reference to it.	T: Type of the column

    MyDataFrame         df;
    std::vector<int>    &col0 =
        df.create_column<int>(static_cast<const char *>("col_name"));