Create a functional React component that displays a greeting message using props.

The task consists of two parts:

1. Create a child component
   • Create a component called Greeting.
   • Accept a prop called name.
   • Render an h2 element with the text: Hello, {name}.
2. Create a parent component
   • Create a component called App.
   • Render the Greeting component inside it.
   • Pass the value "Oliver" to the name prop.
3. Render the App component
   • Render the App component using root.render.

• The child component receives data using props.
• Use {props.name} inside JSX.
• Pass the name prop when rendering Greeting.
• The App component should be rendered to the DOM.