legal: Add default license

Change-Id: I2d3da32fc9feede36ef6af11f60663ef8cfd2936
Relate-to: #2
Signed-off-by: Philippe Coval <rzr@users.sf.net>

debian/copyright

@@ -2,6 +2,11 @@ Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
 Upstream-Name: pinball-table-hurd
 Source: <https://github.com/rzr/pinball-table-hurd>
 
+Files: *
+Copyright: 2001 Henrik Enqvist <henqvist@excite.com>
+	   2019 Philippe Coval <rzr@users.sf.net>
+License: GPL-2+
+
 Files: data/hurd/bump.wav
        data/hurd/bumphard.wav
        data/hurd/bumpsoft.wav
@@ -32,7 +37,7 @@ Copyright: 2010 Paolo Caroni <kenren89@gmail.com>
            1997 Stephen McCamant
 License: CC-BY-SA-3.0
 
-       data/hurd/freesoftwaresong.*
+Files: data/hurd/freesoftwaresong.*
 Copyright: 2010 Paolo Caroni <kenren89@gmail.com>
            1993 Richard M. Stallman
 License: GPL-2+