Gulp file setup

[paulbreuler]

Currently the gulp task to validate markdown checks all files and will output issues to the console. It does not have a way to prevent commits at this time.

Need a way to determine if there is any failure and after all files have been examined return -1 to prevent the push to the remote from happening to ensure only valid markdown is pushed to the repo.

Haven't tested committing using a GUI only VS Code terminal and Git Bash have been tested.