added file size

src/functions/sizeToReadable.ts

@@ -0,0 +1,7 @@
+function sizeToReadable(size: number): string {
+	const i = Math.floor(Math.log(size) / Math.log(1024))
+	return (size / Math.pow(1024, i)).toFixed(2) + " " + ["B", "kB", "MB", "GB", "TB"][i]
+
+}
+
+export default sizeToReadable