Add package list that populates `requirements.txt` to the workflow

[pjbull]

trafficstars

This issue is for adding a user editable list during project creation that will allow a user to name packages. E.g.:

...
List packages to include [default: pandas,numpy,scikit-learn]:  
...

[brylie]

@pjbull could you please clarify this issue with a description of the problem? I may be reporting a similar issue.

[pjbull]

@brylie Thanks for ping here, added clarification! (Not related to the issue you mentioned)

[jayqi]

Closing—implemented for V2.