Updates documentation to mention the config files

Signed-off-by: Anthony Veaudry <anthony@veaudry.pro>

Author: anthony0030

CONTRIBUTING.md

@@ -20,6 +20,7 @@ The animations in Animate.css should follow a few key principles:
 1. Match the naming convention (camelCase, categorized [fades, bounces, etc])
 2. Indent with two spaces
 3. End each file with a blank line
+4. Please use the configurations in .editorconfig and .prettierrc to help keeps styling consistant.
 
 ## How To Contribute