Add a section about interoperability to readme #168

Job	Run time
Audit dependencies	20s
Build Docker image	3m 33s
Clippy (x86_64-unknown-linux-gnu, false)	33s
Build and test (stable, x86_64-unknown-linux-gnu, ubuntu-latest, --all-features)	2m 31s
Clippy (aarch64-unknown-linux-gnu, true, -target aarch64-linux-gnu -g)	37s
Format	11s
Build and test (msrv, x86_64-unknown-linux-gnu, ubuntu-latest, --all-features)	2m 45s
Clippy (armv7-unknown-linux-gnueabihf, true, -target arm-linux-gnueabihf -mcpu=generic+v7a+vfp3-d...	43s
Check unused dependencies	1m 11s
Clippy (x86_64-unknown-linux-musl, true, -target x86_64-linux-musl)	39s
Build and test (stable, x86_64-unknown-linux-musl, ubuntu-latest, --all-features)	2m 32s
Build and test (stable, aarch64-unknown-linux-gnu, ubuntu-latest, --all-features)	3m 49s
Build and test (stable, x86_64-unknown-linux-gnu, ubuntu-latest, --no-default-features --features...	2m 48s
Build and test (stable, x86_64-unknown-linux-gnu, ubuntu-latest, --no-default-features --features...	2m 21s
	24m 33s

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