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docs: add Signed commits section to CONTRIBUTING (#78) #198

Job	Run time
rust-ci / Detect Cargo.toml	6s
rust-ci / Cargo check + clippy + fmt	30s
rust-ci / Cargo audit (security)	3m 3s
rust-ci / llvm-cov line coverage	0s
rust-ci / Cargo test	34s
	4m 13s