Develop a notebook to illustrate all the data node operations

[tschaffter]

Add one block of code for all the operation supported by the Data Node API. This notebook will be used by NLP Sandbox users as a reference to interact with a data node instance.

Create a code block for the following operation:

• create a dataset
• get all datasets
• get one dataset
• create one fhir store
• get all fire stores
• get one fhir store
• add one patient
• get all patients in a dataset
• etc.