Add A New Slide

## We Need More Slides
Grab another octocat and create a new slide from scratch.
If you need help, check out the Appendix in the training manual.

Review the existing slides and the Appendix in the training manual to understand the expected structure and style. Create one additional slide from scratch featuring another octocat, then confirm it matches the surrounding slides and is included in the presentation.

索引モデルが issue の本文から書いたものです。