problems in assignment 3

[jrmcgarvey]

The assignment should specify the names of the .py file to be created, and where. The assignment asks the student to do some things that are unexplained by the lesson, so the lesson needs to be updated as per issue 14. The lesson asks the student to create a file called employees.csv. A different name should be used, as the python_homework repository already has a file of that name in the csv directory.

It seems to me that the assignment is also too brief -- that students should have to practice skills more.