You can find a Connector Suite example project here on the link below or through the app store and searching on Watson.
To add on Corné's answer:
* In the Mendix Desktop Modeler you can open the App store tab and search for Watson.
Then download the IBM Watson Connector Suite Connector.
After installation all the IBM Watson connectors are directly available from the Microflow toolbox.
* In the App store we've also added a IBM Watson Connector sample project. This contains some examples.