Update compatibility missions.txt

Author: TheGiraffe3

data/compatibility missions.txt

@@ -1,3 +1,13 @@
+# Copyright (c) 2024 by Loymdayddaud
+#
+# Endless Sky is free software: you can redistribute it and/or modify it under the
+# terms of the GNU General Public License as published by the Free Software
+# Foundation, either version 3 of the License, or (at your option) any later version.
+#
+# Rumskib 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 GNU General Public License for more details.
+
 mission "Rumskib: Blended Ships installed"
 	landing
 	invisible