Imports of fileserver command

PathSynopsis
github.com/go-chi/chi/v5Package chi is a small, idiomatic and composable router for building HTTP services.
github.com/go-chi/chi/v5/middleware
net/httpPackage http provides HTTP client and server implementations.
osPackage os provides a platform-independent interface to operating system functionality.
path/filepathPackage filepath implements utility routines for manipulating filename paths in a way compatible with the target operating system-defined file paths.
stringsPackage strings implements simple functions to manipulate UTF-8 encoded strings.