add README #448

Job	Run time
Build x86_64-unknown-linux-gnu target	3m 52s
Build aarch64-apple-darwin target	2m 55s
Build x86_64-apple-darwin target	4m 6s
Build x86_64-pc-windows-msvc target	6m 15s
Build x86_64-unknown-linux-musl target	6m 25s
lint	2m 41s
rust-test	3m 1s
rust-test-vectors	4m 2s
test (ubuntu-latest)	2m 52s
typescript	4m 44s
test (macos-latest)	2m 29s
test (windows-latest)	5m 36s
kotlin-build-test-deploy-snapshot	1m 58s
kotlin-acceptance-test (ubuntu-latest)	19s
kotlin-acceptance-test (macos-latest)	20s
kotlin-acceptance-test (macos-12)	40s
kotlin-acceptance-test (windows-latest)	29s
	52m 44s

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