Added files from forked repo to a standalone, as per the request from @altercation in https://github.com/altercation/solarized/pull/18#issuecomment-1005224

Updated hex colour values, thanks to @tigris.

Added solarized solarized colours configuration for XFCE4 Terminal

Add 'vim-colors-solarized/' from commit '3da9bd10d3b8c1ad6e2a5ab8617ef8c82fca0df7'

git-subtree-dir: vim-colors-solarized
git-subtree-mainline: 7993f543f8bfc8334b20116a4a03dd0b28d3a237
git-subtree-split: 3da9bd10d3b8c1ad6e2a5ab8617ef8c82fca0df7