Add demo #12

Job	Run time
Ensure 'cargo fmt' has been run	11s
Ensure 'cargo clippy' has no warnings	26s
Extract crate metadata	3s
aarch64-unknown-linux-gnu (ubuntu-22.04)	1m 47s
aarch64-unknown-linux-musl (ubuntu-22.04)	1m 37s
arm-unknown-linux-gnueabihf (ubuntu-22.04)	1m 51s
arm-unknown-linux-musleabihf (ubuntu-22.04)	2m 7s
i686-pc-windows-msvc (windows-2022)	2m 24s
i686-unknown-linux-gnu (ubuntu-22.04)	1m 28s
i686-unknown-linux-musl (ubuntu-22.04)	1m 38s
x86_64-apple-darwin (macos-12)	59s
aarch64-apple-darwin (macos-14)	44s
x86_64-pc-windows-gnu (windows-2022)	2m 11s
x86_64-pc-windows-msvc (windows-2022)	2m 8s
x86_64-unknown-linux-gnu (ubuntu-22.04)	1m 29s
x86_64-unknown-linux-musl (ubuntu-22.04)	1m 43s
	22m 46s

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