docs: add Setup Workspace demo GIF to README #269

Job	Run time
unit-test (ubuntu-latest)	24s
unit-test (macos-latest)	1m 5s
unit-test (windows-latest)	54s
build	28s
integration-test (windows-latest)	2m 14s
integration-test (ubuntu-latest)	59s
integration-test (macos-latest)	1m 26s
	7m 30s

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