Clarify copyright and waiver

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+Argeo Build - Minimalistic build system written in Java
+
+Copyright 2022-2023 Mathieu Baudier
+Copyright 2022-2023 Argeo GmbH
+
+To the extent possible under law, the copyright owners waived all copyright and 
+related or neighboring rights to this program.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the CC0 version 1.0
+license for more details: https://creativecommons.org/publicdomain/zero/1.0/legalcode
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