[stronglikedan]

> Why is a repository called 'Microsoft Store' being hosted on a seemingly random github account?

Why not? I could spin up a repo called "Bradford Store" or "Google Store" or whatever I want. The maintainer just wanted "Microsoft Store"

> Why doesn't the README file explain what this repository is doing?

It does, and also answers your first question.

> OP, what did you hope to accomplish with this submission?

Because they knew HN would be interested. Same as every other OP that submits something.

> I'm open to the possibility that I'm misunderstanding something....

It does seem to be the case.