Summary

Initializing the block theme refers to making the theme identified as a block theme by WordPress. WordPress relies on having a index.html file inside the templates folder for a theme to be recognized as a block theme.
Any theme in WordPress must have a style.css file that contains the theme's meta information in the file headers.
Note: You will have to add a index.php file in the root even in a block theme for it to be a valid theme. There is an open ticket discussion removal of this requirement.

References

Block Theme Overview

Acceptance Criteria

• Add the style.css file with the necessary theme metadata
• Add the index.html inside the templates folder