Update contributing docs to have a how-to guide for Visual Studio Code

[jezdez]

This should following the Diátaxis guide on how-tos.

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Thanks!

[kathatherine]

Hi, @jezdez, the Anaconda docs recently updated their page on using Anaconda Distribution/Miniconda with VSCode. Is similar to what you'd like to see in the conda docs as well?

https://docs.anaconda.com/working-with-conda/ide-tutorials/vscode/