Update README.md

Author: alexgurr

dark-mode/README.md

@@ -2,13 +2,15 @@
 
 ### Difficulty: Medium | Time required: ~ 30 minutes
 
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 # Requirements
 - Add dark-mode switching functionality to the *existing* dark-mode button
   - Utilise the *existing* dark-mode scss file by adding a `dark-mode` class to the root `html` element
 - When in Dark mode:
   - The button icon should be `faSun`
   - The button icon colour should be `(#FFA500)`. You can use the `color` prop on the `Icon` component.
 
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 # Think about
 - How we would use Dark mode on other potential routes/components in a bigger application. Would your solution work for this?
 - How we can apply a class to the `html` DOM element