add example about compression #4404

Job	Run time
cargo-hack	5m 56s
check-docs	40s
cargo-public-api-crates (axum)	59s
check	1m 57s
cargo-public-api-crates (axum-core)	49s
cargo-deny check (advisories)	24s
cargo-public-api-crates (axum-extra)	56s
cargo-deny check (bans licenses sources)	26s
dependencies-are-sorted	19s
cargo-public-api-crates (axum-macros)	46s
Spell Check with Typos	6s
test-nightly	2m 27s
armv5te-unknown-linux-musleabi	1m 3s
test-docs	2m 15s
test-msrv	7m 1s
test-versions (stable)	3m 23s
wasm32-unknown-unknown	23s
test-versions (beta)	3m 5s
	32m 55s

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