add sass/scratch.scss and associated sass files

Resources/public/sass/contrib/bourbon/functions/_tint.scss

@@ -0,0 +1,24 @@
+@charset "UTF-8";
+
+/// Mixes a color with white.
+///
+/// @param {Color} $color
+///
+/// @param {Number (Percentage)} $percent
+///   The amount of white to be mixed in.
+///
+/// @example scss - Usage
+///   .element {
+///     background-color: tint(#6ecaa6, 40%);
+///   }
+///
+/// @example css - CSS Output
+///   .element {
+///     background-color: #a8dfc9;
+///   }
+///
+/// @return {Color}
+
+@function tint($color, $percent) {
+  @return mix(#fff, $color, $percent);
+}