revise format of md files
raise exception at first approval
refactored to an Approvals class
move Approvals to its home
pass when approved; fail when not approved
moved approvals file to src
will save a received txt file if no approved
verify based on approved and received files
remove useless files
refactoring - has filemanager class and move test methods to test class
refactor to a reporter, get ready for diff reporter
refactored class methods to instance method
renamed productbacklog.md to todolist.md
make will call lettuce
decouple implementation codes with steps codes
Merge pull request #1 from lidingshan/master

Decouple implementation codes with test codes
Merge pull request #1 from tengzy/master

Merge initial work to main