Add VScode's settings.json to .gitignore

[JWMichalski]

VScode creates a settings.json files when editing code.
Adding it to .gitignore would avoid accidental commits.

[DavidMcCann-NOC]

VScode creates a settings.json files when editing code. Adding it to .gitignore would avoid accidental commits.

Good idea, and we can always re-visit this again in the future if its useful to keep it in.