Added Jest test debugging in vsCode

[akrigline]

This Adds a .vscode directory with a launch.json config file per the example here.

It'll allow you to run tests with debugging enabled within VSCode.

To Test:

1. Start the debugger in VSCode "Debug Jest Tests".
2. Add a breakpoint to a test file (click to the left of the line number)
3. In the vscode terminal, hit a to run all tests. By default it will watch only the files that have changed from the last commit.

[dfagan2]

@akrigline , while cool, I'd vote for this being an optional add on at the project level, not here in Gantry. I don't think our starter kit should have any concept baked in of which IDE, because a) someone might not being using VSCode, and b) a year from now VSCode might be "so last year"

@stuarttannehill-rp - thoughts?