docs: add Simplified Chinese README (#677) #699

Job	Run time
build-freebuff	1m 9s
build-and-smoke-freebuff-windows	20s
e2e-terminal-command	1m 6s
e2e-agent-startup	2m 21s
e2e-version	1m 8s
e2e-startup	1m 10s
e2e-ads-behavior	1m 3s
e2e-help-command	1m 23s
e2e-slash-commands	1m 6s
e2e-code-edit	58s
	11m 44s

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