add docs #17

Job	Run time
Check wasm32 + wasm-bindgen	2m 21s
android	27s
cargo-deny aarch64-apple-darwin	38s
cargo-deny aarch64-linux-android	38s
Check wasm32+atomics	1m 21s
cargo-deny i686-pc-windows-gnu	40s
Format + check + test	2m 21s
cargo-deny i686-pc-windows-msvc	38s
ios	23s
cargo-deny i686-unknown-linux-gnu	42s
Run tests	57s
Check Windows	1m 49s
cargo-deny wasm32-unknown-unknown	38s
cargo-deny x86_64-apple-darwin	40s
cargo-deny x86_64-pc-windows-gnu	40s
cargo-deny x86_64-pc-windows-msvc	38s
cargo-deny x86_64-unknown-linux-gnu	38s
cargo-deny x86_64-unknown-linux-musl	39s
cargo-deny x86_64-unknown-redox	38s
	17m 26s

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