added wails Svelte Template

frontend/svelte.config.js

@@ -0,0 +1,7 @@
+import sveltePreprocess from 'svelte-preprocess'
+
+export default {
+  // Consult https://github.com/sveltejs/svelte-preprocess
+  // for more information about preprocessors
+  preprocess: sveltePreprocess()
+}