Implement unit tests

[thirstyape]

• Create a new project for unit testing (can review Easy Password Validator for example)
• Adapt the examples imported in Import Documentation #7 to create unit tests using xunit
• Remove any unnecessary commenting from examples (ie. commented code, conversation, etc.)
• Update README to link examples as per changes

[thirstyape]

@nehemiah-nf did you start on this one?

[nehemiah-nf]

@thirstyape Yes but a lot of my time was going through the options for comparing excel spreadsheets. I have a script that gets close for comparing two spreadsheets using openpyxl and just the boilerplate from xunit right now.