Documentation
- **contributing**: Update contributing guide
([`d5dc425`](https://github.com/Kitware/pan3d/commit/d5dc425e226e279a2888a9ecb0109f8fc5113a92))
Features
- **Slice Explorer**: Adding inital version of the slice explorer
([`3147a46`](https://github.com/Kitware/pan3d/commit/3147a462368c00e44f0a0a33073b66681b601e03))
Adding Slice Explorer -- the main module in the `explorers` directory -- a driver example using
python in `examples` -- a jupyter notebook demo example