Document somewhere that vscode supports 8 character hex colors

[Tyriar]

[gerane]

I had a lot of issues when converting themes from tmthemes. Code doesn't support as many color codes as other editors.

A decent number of themes had colors that were bright red or converted to some other crazy color.

[Tyriar]

AFAIK vscode only supports 6 and 8 digit hex notation, the documentation isn't too comprehensive atm.

I found a bunch of themes broke because they expected text background color to be supported, but vscode doesn't.