POC of the drag and drop sidebar

using the react-example-app in geppetto meta:

- add one simple react component that display text (does not need styling)
- add this to the componentsMap
- add this component to the layout
- create a sidebar in the example with draggable text
- drag and drop the text in the flexlayout widget you created in the first step
- the widget has to detect what has been dropped to him and display that text.

aim to discover any potential issue with the library and flexlayout working together.