Revert "remove invisible cached file"

This reverts commit a06fd8c1e28664868e5253bf82ef6fce223600eb.
Revert "fixed filename on readme"

This reverts commit dba06c29d8486900b7675af899546c9e88d38b08.
Revert "added readme"

This reverts commit 0fca2b284478eb73d6e2bf6ffa9dcb7745ed8220.