message: docs(readme): add example section
diff: # :ocean: React Flow
  -React Flow is a library for building node-based graphs. You can easily implement custom node types and it comes with plugins like a MiniMap and a Controls Panel.
  +React Flow is a library for building node-based graphs. You can easily implement custom node types and it comes with plugins like a MiniMap and a Controls Panel. Check out the [demo](https://react-flow.netlify.com/) graph.
  - [Installation](#installation)
  - [Usage](#usage)
  @@ -16,6 +16,7 @@ React Flow is a library for building node-based graphs. You can easily implement
  - [Plugins](#plugins)
  - [Minimap](#minimap)
  - [Controls](#controls)
  +- [Examples](#examples)
  ## Installation
  @@ -194,3 +195,12 @@ const GraphWithControls = () => (
  - `style`: css properties
  - `className`: class name
  +
  +## Examples
  +
  +You can find all examples in the [example](example) folder. They are also deployt:
  +
  +- [basic](https://react-flow.netlify.com/basic)
  +- [empty](https://react-flow.netlify.com/empty)
  +- [basic](https://react-flow.netlify.com/basic)
  +- [custom nodes](https://react-flow.netlify.com/)
  