changed styling and folder structure to sass

src/sass/abstracts/_variables.scss

@@ -0,0 +1,7 @@
+$color-primary: #55c57a;
+$color-primary-light: #55c57a;
+$color-primary-dark: #28b485;
+
+$color-grey-dark: #777;
+$color-white: #fff;
+$color-black: #000;