By attendance feature, I am assuming that people want to be able to add a column to the Canvas course Grade Book that will track the attendance for that class. While I have heard rumor of an attendance feature...
... it is still in beta, and not ready for full production mode here at CGCC. HOWEVER, you certainly could create an Attendance "assignment" in your Canvas class (which, as you now know, would immediately create an associated "Attendance" column in your Grade Book), and just create a grading rubric that has your attendance grading scheme for your class.
Then, after each class, if there were any absences, you could just update those students via Speedgrader: