added comment

src/migrateFileSystem.js

@@ -1,6 +1,9 @@
 
 import { Storage } from 'remix-lib'
 
+/*
+  Migrating the files to the BrowserFS storage instead or raw localstorage
+*/
 export default (fileProvider) => {
   const fileStorage = new Storage('sol:')
   if (fileStorage.keys().length === 0) return