docs: add feature description in readme document #26

Job	Run time
Clippy	16s
Rustfmt	17s
Test (linux-amd64, ubuntu-latest, x86_64-unknown-linux-gnu)	21s
MSRV (ubuntu-latest)	28s
Test (android-arm64, ubuntu-latest, aarch64-linux-android, --no-run)	1m 55s
MSRV (macos-latest)	51s
MSRV (windows-latest)	51s
Test (android-amd64, ubuntu-latest, x86_64-linux-android, --no-run)	1m 12s
Test (macos-amd64, macos-latest, x86_64-apple-darwin)	2m 25s
Test (macos-arm64, macos-14, aarch64-apple-darwin)	25s
Test (ios-arm64, macos-latest, aarch64-apple-ios, --no-run)	1m 23s
Test (windows-amd64, windows-latest, x86_64-pc-windows-msvc)	1m 5s
Test (windows-arm64, windows-latest, aarch64-pc-windows-msvc, --no-run)	2m 35s
	14m 4s

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