Add an `AGENTS.md` file #62

Job	Run time
tests (macos-latest, https://ziglang.org/download/0.16.0/zig-aarch64-macos-0.16.0.tar.xz, zig-aar...	27s
tests (windows-latest, https://ziglang.org/download/0.16.0/zig-x86_64-windows-0.16.0.zip, zig-x86...	1m 57s
tests (ubuntu-latest, https://ziglang.org/download/0.16.0/zig-x86_64-linux-0.16.0.tar.xz, zig-x86...	18s
	2m 42s

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