* Add a skeleton app structure
* Update `README.md` for skeleton app
* Add `skeleton-app` to pre commit
* [pre-commit.ci] auto fixes from pre-commit.com hooks
for more information, see https://pre-commit.ci
* Update readme
Co-authored-by: pre-commit-ci[bot] <66853113+pre-commit-ci[bot]@users.noreply.github.com>