add example about compression #4406

Job	Run time
cargo-hack	5m 56s
check	1m 8s
check-docs	28s
cargo-public-api-crates (axum)	39s
cargo-public-api-crates (axum-core)	21s
cargo-deny check (advisories)	30s
dependencies-are-sorted	24s
cargo-public-api-crates (axum-extra)	30s
Spell Check with Typos	5s
cargo-deny check (bans licenses sources)	24s
cargo-public-api-crates (axum-macros)	19s
test-docs	1m 53s
armv5te-unknown-linux-musleabi	45s
test-msrv	7m 45s
test-nightly	2m 2s
test-versions (stable)	2m 21s
test-versions (beta)	1m 54s
wasm32-unknown-unknown	32s
	27m 56s

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