Adds documentation on how to run the custom Eclipse on macOS #420

Job	Run time
create-splash-image	5s
collect-github-api-artifacts	9s
build-linux-dev-ci	6m 34s
build-linux-dev-hipe	14m 50s
build-linux-user	18m 7s
build-linux-dev	15m 27s
build-linux-user-ci	10m 34s
build-macos-dev	17m 53s
build-macos-dev-hipe	16m 3s
build-macos-user	15m 10s
build-windows-dev	18m 9s
build-windows-dev-hipe	9m 49s
build-windows-user	19m 46s
create-release	0s
	2h 42m 36s

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