SDL: docs/README-platforms.md: Add DOS.

From 1226725e9ac1321614e1ecd0d7f245285bd73131 Mon Sep 17 00:00:00 2001
From: Ozkan Sezer <[EMAIL REDACTED]>
Date: Mon, 27 Apr 2026 18:04:02 +0300
Subject: [PATCH] docs/README-platforms.md: Add DOS.

[ci skip]
---
 docs/README-platforms.md | 1 +
 1 file changed, 1 insertion(+)

diff --git a/docs/README-platforms.md b/docs/README-platforms.md
index 98e86000570b3..6b280f3ff1fdd 100644
--- a/docs/README-platforms.md
+++ b/docs/README-platforms.md
@@ -5,6 +5,7 @@
 SDL3 has been known to work on the following platforms at some point:
 
 - [Android](README-android.md)
+- [DOS](README-dos.md)
 - [Emscripten](README-emscripten.md) (Web browsers)
 - [FreeBSD](README-bsd.md)
 - [Haiku OS](README-haiku.md)