update README

Author: jscottsmith

README.md

@@ -85,6 +85,10 @@ const HorizontalParallax = () => (
 );
 ```
 
+## How it works
+
+TODO: **Explain how and when effects are applied** with some illustrations and demos.
+
 **Warnings:**
 
 1. This lib was designed to be used on `relative` or `absolute` positioned elements that scroll naturally with the page. If you use `fixed` positioning on either the element itself or the parent you will encounter issues. More on that in [troubleshooting](#troubleshooting).

docs/parallax-component.md

@@ -2,6 +2,18 @@
 
 The main component for manipulating a DOM element's position based on it's position within the viewport.
 
+## Example
+
+```jsx
+import { Parallax } from 'react-scroll-parallax';
+
+const VerticalParallax = () => (
+  <Parallax y={[-20, 20]}>
+    <div className="my-thing" />
+  </Parallax>
+);
+```
+
 ## Parallax Props
 
 The following are all props that can be passed to the `<Parallax>` component: