Add the SkyH5 memo pdf to the repo

[bhazelton]

Description

I forgot to add the SkyH5 memo pdf to the repo in #220. This just adds the missing pdf.

Motivation and Context

Checklists:

Documentation Change Checklist:

• [x] I have read the contribution guide.
• [x] My code follows the code style of this project. Documentation change checklist:
• [ ] Any updated docstrings use the numpy docstring format.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (362e792) 100.00% compared to head (18c720d) 100.00%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #229 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 5 5 Lines 2129 2129 Branches 606 606 ========================================= Hits 2129 2129 ```

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