Document the 'workspaceMount' attribute

[egamma]

pls see #41 (comment)

Let's also add an example for how to use to address https://twitter.com/connorjshea/status/1131403001170518016

//CC @chrmarti

[connorshea]

I'm currently stumped on how to use this since I can't figure out how to give the attribute my present working directory (short of hardcoding it, I guess)

[Chuxel]

@egamma This particular issue (#41) is not fully supported by just adding the workspaceMount option. We need to support using ${workspaceFolder} (#306) to really get this to work. I reopened #41 and will hold off documenting that until we can make a good reccomendation for how that would work.

However, it does support the remote case much better (#171), so I'm adding the property and refining the remote docs.

[Chuxel]

Documented microsoft/vscode-docs@e09e4f5

Will update once #41 (and/or #306) are closed.

[connorshea]

Thanks!