add license headers #23

Job	Run time
integration-tests (windows, windows-latest, fiji-stable-win64-jdk.zip, ImageJ-win64.exe)	1m 6s
integration-tests (macos-arm64-15, macos-15, fiji-stable-macosx-jdk.zip, Contents/MacOS/ImageJ-ma...	1m 19s
integration-tests (ubuntu, ubuntu-latest, fiji-stable-linux64-jdk.zip, ImageJ-linux64)	42s
integration-tests (macos-arm64-14, macos-14, fiji-stable-macosx-jdk.zip, Contents/MacOS/ImageJ-ma...	1m 17s
integration-tests (macos-x86_64, macos-13, fiji-stable-macosx-jdk.zip, Contents/MacOS/ImageJ-macosx)	1m 1s
	5m 25s

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