[docs] ユーザーガイドを追加 (#699) #2338

Job	Run time
build-and-test-java-api (windows-latest)	9m 10s
build-and-test-python-api (windows-latest)	6m 13s
build-and-test-java-api (macos-latest)	7m 25s
actionlint	33s
build-and-test-python-api (macos-latest)	5m 54s
build-unix-cpp-example (macos-latest, osx-x64-cpu-cpp-shared)	3m 32s
build-and-test-java-api (ubuntu-latest)	3m 6s
build-and-test-python-api (ubuntu-latest)	2m 56s
build-unix-cpp-example (ubuntu-latest, linux-x64-cpu-cpp-shared)	1m 50s
c-header	52s
rust-integration-test-strategy-matrix	1s
rust-lint	2m 26s
rust-unit-test	3m 52s
shellcheck	16s
validate-cargo-lock	23s
build-windows-cpp-example	5m 5s
rust-integration-test (windows-2019, directml)	3m 31s
rust-integration-test (macos-11)	2m 43s
rust-integration-test (ubuntu-20.04)	1m 26s
	1h 1m 14s

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