.gitignore: add IDE files

[simaotwx]

These tend to clutter up repositories.

[mholt]

Thank you!

(Huh, I use VS Code but don't have any .vscode folder.)

[simaotwx]

Thank you!

You're welcome :)

(Huh, I use VS Code but don't have any .vscode folder.)

I think it depends on your local settings and configuration. Certain extensions and settings may create this folder.

Here is a more thorough .gitignore file (certain files would still be checked in if you use this one): https://github.com/github/gitignore/blob/218a941be92679ce67d0484547e3e142b2f5f6f0/Global/VisualStudioCode.gitignore

[francislavoie]

I did have a .vscode/ dir when I played around with delve a while back to debug something, because I was configuring the "Run" button in VSCode, which wrote a project-specific .json config file.