Add Supplement as functions #19
Description
Is your feature request related to a problem? Please describe.
When you want to test the response of the system to a pulse, you cant make it.
Describe the solution you'd like
A Supplement_function or Supplement.function style as a way to add supplements using functions of time
Describe alternatives you've considered
A different Class that does it instead of adding it to Supplement
Additional context
Function requested several times