Add CatCMA blog post

[not522]

Contributor Agreements

Please read the contributor agreements and if you agree, please click the checkbox below.

• I agree to the contributor agreements.

Tip

Please follow the Quick TODO list to smoothly merge your PR.

Motivation

The blog post by Hideaki Imamura is helpful for CatCMASampler users.

Description of the changes

This PR adds a link to your blog post.

TODO List towards PR Merge

Please remove this section if this PR is not an addition of a new package.
Otherwise, please check the following TODO list:

• Copy ./template/ to create your package
• Replace <COPYRIGHT HOLDER> in LICENSE of your package with your name
• Fill out README.md in your package
• Add import statements of your function or class names to be used in __init__.py
• Apply the formatter based on the tips in README.md
• Check whether your module works as intended based on the tips in README.md

[y0z]

LGTM