docs: Include "A Mise guide for Swift developers" (#4329)

We recently wrote a guide for Swift developers interested in using Mise,
so I added a link to that resource to this page.

docs/external-resources.md

@@ -2,6 +2,7 @@
 
 Links to articles, videos, and other resources that are relevant to mise.
 
+- 2025-02-04 - A Mise guide for Swift developers - <https://tuist.dev/blog/2025/02/04/mise>
 - 2025-01-26 - devtools.fm: Jeff Dickey - Mise, Usage, and Pitchfork and the Future of Polyglot Tools - <https://www.devtools.fm/episode/129>
 - 2025-01-12 - [fr] Mise-En-Place: Simplifiez la Gestion de vos Environnements et Tâches – <https://blog.stephane-robert.info/docs/developper/autres-outils/mise-en-place/>
 - 2024-11-20 - Migrating from nvm to mise - <https://dev.to/hverlin/migrating-from-nvm-to-mise-4mfp>