Alternative for mocking requests to the Mindee server

[sebastianMindee]

Current mock libraries don't support multipart/form-data for mocking request. As a makeshift solution, access to the root url of the API could be facilitated to re-route requests to a server.

[sebastianMindee]

Fixed in #69 😎 : Until a credible mocking lib releases a stable support for multipart/form-data, the simplest solution is to give access to the root url of an endpoint to allow for direct piping into a private testing server.