docs: add Simplified Chinese README (#677) #6627

Job	Run time
build-and-check	3m 10s
test-integration-packages/billing	1m 6s
test-integration-packages/internal	1m 0s
test-integration-common	47s
test-integration-web	42s
test-integration-cli	46s
test-integration-sdk	1m 15s
test-integration-packages/agent-runtime	39s
test-.agents	42s
test-cli	50s
test-web	50s
test-packages/agent-runtime	51s
test-common	40s
test-packages/billing	47s
test-sdk	46s
test-packages/internal	56s
	15m 47s

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