Add Tutorial for AgentChat Docs #457

Job	Run time
lint	21s
mypy (./packages/autogen-core)	1m 18s
format	19s
mypy (./packages/autogen-magentic-one)	39s
mypy (./packages/agbench)	25s
pyright (./packages/autogen-core)	27s
test (./packages/autogen-core)	45s
mypy (./packages/autogen-ext)	51s
pyright (./packages/autogen-magentic-one)	27s
test (./packages/autogen-magentic-one)	58s
mypy (./packages/autogen-agentchat)	40s
pyright (./packages/agbench)	23s
test (./packages/autogen-ext)	1m 12s
pyright (./packages/autogen-ext)	28s
test (./packages/autogen-agentchat)	22s
pyright (./packages/autogen-agentchat)	22s
check-proto-changes-python	19s
docs (./packages/autogen-core)	31s
	10m 47s

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