chore: Add a template for issues

[chansuke]

Closes #29

https://docs.github.com/en/communities/using-templates-to-encourage-useful-issues-and-pull-requests/configuring-issue-templates-for-your-repository

[cordx56]

Thank you for your PR.

Did you cite this from another template or use AI? Please check my comment.
I feel it's very redundant and contains some mistakes.

[cordx56]

Your change is fine, but it contains one mistake.

[cordx56]

OK, it is fine.
Thank you!