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cpubits: move usage example to README.md (#1421) #331

Job	Run time
test (1.85.0)	1m 28s
test-miri (s390x-unknown-linux-gnu)	1m 8s
test-miri (x86_64-unknown-linux-gnu)	50s
test-careful	1m 17s
test (stable)	1m 41s
build (1.85.0, thumbv7em-none-eabi)	15s
build (1.85.0, wasm32-unknown-unknown)	18s
build (stable, wasm32-unknown-unknown)	8s
build (stable, thumbv7em-none-eabi)	15s
	7m 20s