Added INTRO-xcode.md

docs/INTRO-xcode.md

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+# Introduction to SDL with Xcode
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+The easiest way to use SDL is to include it as a subproject in your project.
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+We'll start by creating a simple project to build and run [hello.c](hello.c)
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+- Create a new project in Xcode, using the App template and selecting Objective C as the language
+- Remove the .h and .m files that were automatically added to the project
+- Remove the main storyboard that was automatically added to the project
+- On iOS projects, select the project, select the main target, select the Info tab, look for "Custom iOS Target Properties", and remove "Main storyboard base file name" and "Application Scene Manifest"
+- Right click the project and select "Add Files to [project]", navigate to the SDL docs directory and add the file hello.c
+- Right click the project and select "Add Files to [project]", navigate to the SDL Xcode/SDL directory and add SDL.xcodeproj
+- Select the project, select the main target, select the General tab, look for "Frameworks, Libaries, and Embedded Content", and add SDL3.framework
+- Build and run!
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