alacritty/README.md: added.

Author: mubin-thinks

alacritty/README.md

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+## Installing Charcoal for Alacritty
+In order to install Charcoal for the Alacritty terminal, you will have to edit some
+files. You can use your favourite text-editor. Copy the contents of your preferred
+colorscheme from Charcoal Repository's `alacritty/` folder. After you have copied all the
+contents of your preferred theme file, paste it at the top of your
+`~/.config/alacritty/alacritty.toml`.