Add few comments to CSS props in webpack config

Author: alex35mil

client/webpack.client.base.config.js

@@ -76,7 +76,13 @@ module.exports = {
     ],
   },
 
+  // Place here all postCSS plugins here, so postcss-loader will apply them
   postcss: [autoprefixer],
+
+  // Place here all SASS files with variables, mixins etc.
+  // And sass-resources-loader will load them in every CSS Module (SASS file) for you
+  // (so don't need to @import them explicitly)
+  // https://github.com/shakacode/sass-resources-loader
   sassResources: ['./app/assets/styles/app-variables.scss'],
 
 };