Add iOS example to mainline!

examples/ios_demo/README.md

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+# wry
+
+## iOS
+
+Must run Xcode on rosetta. Goto Application > Right Click Xcode > Get Info > Open in Rosetta.
+
+If you are using M1, you will have to run `cargo build --target x86_64-apple-ios` instead of `cargo apple build` if you want to run in simulator.
+
+Otherwise, it's all `cargo apple run` when running in actual device.