debian: Clean up to look like other osmocom projects

Change-Id: Id71699642b799f5b2f8f3b794b9493ddaeb70cc0
diff --git a/debian/copyright b/debian/copyright
new file mode 100644
index 0000000..9731a49
--- /dev/null
+++ b/debian/copyright
@@ -0,0 +1,22 @@
+Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Upstream-Name: OsmoPCAP
+Source: http://cgit.osmocom.org/osmo-pcap/
+
+Files: *
+Copyright: 2011 Holger Freyther and On-Waves
+           2018 sysmocom s. f. m. c. GmbH <info@sysmocom.de>
+License: AGPL-3+
+
+License: AGPL-3+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU Affero General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ 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
+ GNU Affero General Public License for more details.
+
+ You should have received a copy of the GNU Affero General Public License
+ along with this program.  If not, see <http://www.gnu.org/licenses/>.