Add --useVscodeSettings flag just like --useTsconfig and --useTslint

[cspotcode]

I would like to point tsfmt to a vscode-recommended-settings.json and parse it like .vscode/settings.json.

I track vscode-recommended-settings.json in Git and use it to control tsfmt. Users can copy it to .vscode/settings.json and VSCode will format code in my project's style.

I want to avoid adding .vscode/settings.json to Git. If it's tracked by git and someone wants additional, personal options in .vscode/settings.json, git will constantly ask them to commit their changes. This is why I would like to instead distribute a vscode-recommended-settings.json.

I would invoke tsfmt like this:

tsfmt --useVscodeSettings ./vscode-recommended-settings.json

[vvakame]

thanks! 👍