Adding Svelte in front-end frameworks list

Since there is no clear "order by" rules here, I'm following the "newest additions first" ordering. Perhaps we should make this list sorted alphabetically?

Author: kazzkiq

collections/front-end-javascript-frameworks/index.md

@@ -1,5 +1,6 @@
 ---
 items:
+ - sveltejs/svelte
  - marko-js/marko
  - mithriljs/mithril.js
  - angular/angular