Added Zapier Integration

To make it easy to share the submitted data with other services I added a Zapier integration. Wich is one of the most used noCode/Lowcode tools.

To do that I added the possibility to read the posted data as JSON with an API key and the form key already in use to post the data the normal way.

Right now I have to wait that at least 10 people create Zaps with my integration to be able to make it public.