Added add-num.py to repo.  Practice Python functions.
Another git test.
Added installation instructions
Commit all
Second commit all.
add_three function included.
Replaced add_two with add_three
New feature has been tested.

Merge branch 'feature1'
Added a new module
Added new module
Some changes to doc and code.
Conflicts resolved
Merge branch 'master' of github.com:geekyhybrid/WISE_software_carpentry