rust

doc(moonbit): add MoonBit explanation #205

Job	Run time
build (component-model/examples/tutorial/adder, component)	15s
build (component-model/examples/tutorial/calculator, component)	28s
build (component-model/examples/example-host)	1m 58s
build (component-model/examples/tutorial/command, component)	33s
	3m 14s

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