docs: Mention that Node 12 is required

Closes #308

Author: MarcusNotheis

README.md

@@ -48,6 +48,7 @@ You can play around with our components by visiting our [Storybook](https://sap.
 ## Requirements
 
 - [React](https://www.npmjs.com/package/react) and [React-DOM](https://www.npmjs.com/package/react-dom) (**16.8.0 or higher**)
+- [Node.js](https://nodejs.org/) (**version 12 or higher** ⚠️)
 
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 <a name="download"></a>

packages/docs/Welcome.stories.mdx

@@ -19,6 +19,11 @@ UI5 Web Components for React is a Fiori3 compliant React library built on top of
 With the help of UI5 Web Components for React, you can use UI5 Web Components as if they were native React components.
 In addition to that, UI5 Web Components for React is providing complex components and layouts on top of the UI5 Web Components.
 
+## Requirements
+
+- [React](https://www.npmjs.com/package/react) and [React-DOM](https://www.npmjs.com/package/react-dom) (**16.8.0 or higher**)
+- [Node.js](https://nodejs.org/) (**version 12 or higher** ⚠️)
+
 ## Getting Started
 
 **Prerequisite: You have a React app.** In case you don't, we recommend to create one using [create-react-app](https://facebook.github.io/create-react-app/).<br/>