func FileServer(fs *FileSystem) http.Handler {
	h := &fileHandler{
		fs: fs,
	}
	return h
}
FileServer returns a HTTP handler that serves
HTTP requests with the contents of the ZIP file system.
It provides slightly better performance than the
http.FileServer implementation because it serves compressed content
to clients that can accept the "deflate" compression algorithm.
package zipfs
import (
	"archive/zip"
	"fmt"
	"io"
	"mime"
	"net/http"
	"os"
	"path"
	"path/filepath"
	"strings"
	"time"
)