Create plugin for VSCode

[bjompen]

Related to #8

It would be super neat to have this in vscode, automatically notifying me if a secret is in my code, the same style as the git plugin works.

I have absolutely 0 experience in VSCode plugins though, so I have no idea if it's possible, or how, but if people would like it I could spend some time researching (or someone else create it ;) )