Add Modeling via API Example

[philippfromme]

What is this example supposed to showcase?

The example is supposed to show how to programmatically create elements using the internal APIs of bpmn-js. Users of the toolkit would benefit a lot from such an example.

As part of this example

• the difference between diagram shapes and business objects should be explained
• the respective APIs should be used (modeling, element factory, bpmn factory, ...)
• additional resources (e.g. bpmn-moddle) should be linked

Similar Example:

https://github.com/ingorichtsmeier/camunda-modeler-plugin-connected-elements