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docs: add Signed commits section to CONTRIBUTING (#131) #276

Job	Run time
rust-ci / Detect Cargo.toml	6s
rust-ci / Cargo check + clippy + fmt	6s
rust-ci / Cargo audit (security)	0s
rust-ci / Coverage (tarpaulin + codecov)	0s
rust-ci / Cargo test	-1s
	11s