Add README n stuff

Foil.xcodeproj/project.pbxproj

@@ -7,6 +7,7 @@
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@@ -20,6 +21,8 @@
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@@ -53,6 +56,8 @@
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 			isa = PBXGroup;
 			children = (
+				D42485DE24B6D09100E7EDEE /* README.md */,
+				D42485E024B6D76700E7EDEE /* SimulationImage.png */,
 				D4AC68B6245CF43F00917569 /* Foil */,
 				D4AC68C7245CF56900917569 /* Renderer */,
 				D4F680AA245FACA4000B8EF2 /* Simulation */,
@@ -173,6 +178,7 @@
 			files = (
 				D4AC68BC245CF44000917569 /* Assets.xcassets in Resources */,
 				D4AC68BF245CF44000917569 /* Main.storyboard in Resources */,
+				D42485E124B6D76700E7EDEE /* SimulationImage.png in Resources */,
 			);
 			runOnlyForDeploymentPostprocessing = 0;
 		};

README.md

@@ -0,0 +1,13 @@
+# Foil
+
+## Apple's Metal example code, hugely simplified and translated to Swift
+
+In case it helps anyone, I translated this from Apple's Objective-C example
+[Selecting Device Objects For Compute Processing](https://developer.apple.com/documentation/metal/gpu_selection_in_macos/selecting_device_objects_for_compute_processing).
+I pared it down quite a bit too, because I ran into trouble with it and decided to ask for help
+on StackOverflow. For which, many thanks to [Tyler](https://stackoverflow.com/users/988260/tyler)
+for his brilliant [help](https://stackoverflow.com/questions/61742070/macos-metal-app-works-in-obj-c-fails-to-draw-in-swift-translation).
+
+I think it's more-or-less self-explanatory, or maybe I'm just too busy to write a nice, useful
+description of it, or maybe just too lazy. Anyway, build and run, it's fun to watch.
+