fix: create lib folder in skeleton project

people keep getting confused that the alias is not available, so make it available from the start by creating the lib folder in the skeleton template, too

Author: dummdidumm

Diff for: .changeset/strange-colts-work.md

@@ -0,0 +1,5 @@
+---
+'create-svelte': patch
+---
+
+fix: create lib folder in skeleton project

Diff for: packages/create-svelte/templates/skeleton/src/lib/index.ts

@@ -0,0 +1 @@
+// place files you want to import through the `$lib` alias in this folder.