After seeing the comment from @mBeierl, I searched “bash on windows” and came across the following article showing how to setup bash on a Windows machine, Windows Subsystem for Linux.
I was able to generate the “testing.key” and “testing.crt” file and can successfully start the boilerplate extension with “docker-compose up --build” command now and browse to viewer.html page by going to https://localhost:8080/viewer.html
Wanted to post this in case anyone else is having the same trouble getting started. 