Add VSCode settings / config and extensions

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Note that this may require an install script for extensions.

References:

• https://code.visualstudio.com/docs/getstarted/settings
• https://code.visualstudio.com/docs/editor/settings-sync
• https://github.com/karaage0703/vscode-dotfiles/tree/master
• https://pawelgrzybek.com/sync-vscode-settings-and-snippets-via-dotfiles-on-github/
• https://github.com/pawelgrzybek/dotfiles/blob/master/setup-brew.sh

Note that settings are included under $HOME/Library/Application Support/Code/User/settings.json on MacOS.

[FlynnOwen]

Path on Linux may be CODE_PATH=~/.config/Code/User?

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Added for mac

[FlynnOwen]

Reference for extensions installation: https://stackoverflow.com/questions/35773299/how-can-you-export-the-visual-studio-code-extension-list