Add Debian configuration

debian/copyright

@@ -0,0 +1,28 @@
+Format: http://dep.debian.net/deps/dep5
+Upstream-Name: jellyfin-web
+Source: https://github.com/jellyfin/jellyfin-web
+
+Files: *
+Copyright: 2018-2020 Jellyfin Team
+License: GPL-3.0
+
+Files: debian/*
+Copyright: 2020 Joshua Boniface <joshua@boniface.me>
+License: GPL-3.0
+
+License: GPL-3.0
+ This package 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 2 of the License, or
+ (at your option) any later version.
+ .
+ This package 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.
+ .
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <http://www.gnu.org/licenses/>
+ .
+ On Debian systems, the complete text of the GNU General
+ Public License version 2 can be found in "/usr/share/common-licenses/GPL-2".