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.

Start with the Appendix in the training manual to identify the requirements for a new slide. Then inspect the repository's existing slide structure and add another slide featuring an octocat; done means the new slide follows those requirements.

索引モデルが issue の本文から書いたものです。