docs: add feature description in readme document #28

Job	Run time
Test (linux-amd64, ubuntu-latest, x86_64-unknown-linux-gnu)	23s
Rustfmt	12s
Test (android-arm64, ubuntu-latest, aarch64-linux-android, --no-run)	1m 7s
Clippy	13s
MSRV (ubuntu-latest)	26s
Test (android-amd64, ubuntu-latest, x86_64-linux-android, --no-run)	1m 6s
MSRV (macos-latest)	41s
Test (macos-amd64, macos-latest, x86_64-apple-darwin)	2m 22s
MSRV (windows-latest)	50s
Test (macos-arm64, macos-14, aarch64-apple-darwin)	24s
Test (ios-arm64, macos-latest, aarch64-apple-ios, --no-run)	55s
Test (windows-amd64, windows-latest, x86_64-pc-windows-msvc)	2m 40s
Test (windows-arm64, windows-latest, aarch64-pc-windows-msvc, --no-run)	1m 17s
	12m 36s

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