rust

doc(moonbit): add MoonBit explanation #203

Job	Run time
build (component-model/examples/tutorial/adder, component)	16s
build (component-model/examples/tutorial/calculator, component)	19s
build (component-model/examples/example-host)	1m 53s
build (component-model/examples/tutorial/command, component)	21s
	2m 49s

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