[docs] READMEのドキュメントの順番を整理 (#661) #2212

Job	Run time
actionlint	22s
rust-integration-test-strategy-matrix	2s
rust-lint	2m 42s
rust-unit-test	3m 50s
shellcheck	22s
validate-cargo-lock	35s
build-and-test-python-api (windows-latest)	10m 22s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	4m 58s
build-windows-cpp-example	6m 22s
build-and-test-python-api (macos-latest)	3m 47s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	3m 29s
build-and-test-python-api (ubuntu-latest)	3m 41s
c-header	1m 25s
build-and-test-java-api (windows-latest)	10m 58s
build-and-test-java-api (macos-latest)	5m 15s
build-and-test-java-api (ubuntu-latest)	4m 0s
rust-integration-test (windows-2019, directml)	5m 32s
rust-integration-test (macos-11)	3m 27s
rust-integration-test (ubuntu-20.04)	1m 38s
	1h 12m 47s

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