update the Github description

Author: SissyTrashQueen

README.md

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 # InterfaceColors-Addon
 Addon designed to work as a replacement of the default World of Warcraft's interface colors for each Reputation level, Class colors, Quest Difficulty color & Level Number color in the Target's frame. Used and was functional in TurtleWoW.
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+Slash command is /interfacecolors, there are options to change the class colors back to default vanilla colors, retail/Dragonflight modern colors, default Hearthstone colors, brighter (less opaque) Hearthstone colors & TBC colors (default vanilla but shaman color is light blue instead).