SDL upgrade

Frameworks/SDL3.xcframework/ios-arm64/SDL3.framework/INSTALL.md

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+
+# Using this package
+
+This package contains SDL built for Xcode.
+
+To use this package in Xcode, drag `SDL3.framework` into your project.
+
+# Documentation
+
+An API reference, tutorials, and additional documentation is available at:
+
+https://wiki.libsdl.org/SDL3
+
+# Example code
+
+There are simple example programs available at:
+
+https://examples.libsdl.org/SDL3
+
+# Discussions
+
+## Discord
+
+You can join the official Discord server at:
+
+https://discord.com/invite/BwpFGBWsv8
+
+## Forums/mailing lists
+
+You can join SDL development discussions at:
+
+https://discourse.libsdl.org/
+
+Once you sign up, you can use the forum through the website or as a mailing list from your email client.
+
+## Announcement list
+
+You can sign up for the low traffic announcement list at:
+
+https://www.libsdl.org/mailing-list.php
+