Jupyter ang example

[smason747]

Description of the change

jupyter notebook named loadAng.ipynb to manually load a squaregrid and hexgrid ebsd file using orix testing graphcut network setup to cut single channel images

Progress of the PR

• [ ] Docstrings for all functions
• [ ] Unit tests with pytest for all lines
• [ ] Clean code style by running black via pre-commit

Minimal example of the bug fix or new feature

>>> from orix import vector
>>> v = vector.Vector3d([1, 1, 1])
>>> # Your new feature...

For reviewers

• [ ] The PR title is short, concise, and will make sense 1 year later.
• [ ] New functions are imported in corresponding __init__.py.
• [ ] New features, API changes, and deprecations are mentioned in the unreleased section in CHANGELOG.rst.