Update Essence.

readme.md

@@ -1,8 +1,14 @@
 # Essence
 
-On a web project that uses Bootstrap and Webpack, simply clone this repository and add the following `import` statements in your SCSS file.
+On a web project, run the following commands to install Essence:
 
-```sass
-@import 'path/to/variables'; // Optional variables override Essence variables
+```shell
+git submodule add path/to/repo/of/essence
+git mv essence resources/essence
+```
+
+Import Essence from your SASS file:
+
+```scss
 @import 'path/to/essence';
-```
+```