Updates to NifTi file conversion

• Use SimpleITK to generate NifTI files with correct pixel spacing: #6
• Document support for ImagePositionPatient and ReconstructionDiameter data elements: #4

Addition of MONAI model example

v0.0.1

Add an example demonstrating how to intake a MONAI model (#2)

Initital release of SDK

This release includes an SDK for integrating models with the Bunkerhill Health for inference along with a test example that wraps a trained nnUNet model.