Create a codesandbox

[sdirix]

• Create code sandbox demonstrating JSON Forms, for example the react seed.
• Link on website / Readme

[TheZoker]

This is the link, to create the sandbox from the react seed repo:
https://codesandbox.io/s/github/eclipsesource/jsonforms-react-seed

[sdirix]

The current sandbox is broken while the repo locally still works. Please investigate whether that can be fixed or what needs to be done to have a "stable" sandbox.