docs(motion): add orientation listener example to README #5760

Job	Run time
setup (macos-15)	26s
setup (ubuntu-latest)	25s
lint-scripts	20s
lint (motion)	28s
verify-web (motion)	23s
verify-ios (/Applications/Xcode_26.0.app, motion)	1m 27s
verify-android (motion)	29s
	3m 58s

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