Objects API - example/test environment

[alextreme]

For OpenZaak we have test.openzaak.nl as a vendor/customer-neutral environment from which we can showcase, test and provide working examples in the documentation.

I'd like the same for Objects API, as I think a few curl one-liners will show the possibilities a lot clearer. Feel free to setup a test-environment on cindy, for the domainname to be used and questions contact @annashamray