libpsync: add PSync and update NLSR dependency

refs: #4827

Change-Id: I83df4c0532258f490b855335bf94600cc71d7a65
diff --git a/libpsync/debian/copyright b/libpsync/debian/copyright
new file mode 100644
index 0000000..181437c
--- /dev/null
+++ b/libpsync/debian/copyright
@@ -0,0 +1,36 @@
+Format: https://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Upstream-Name: PSync
+Source: http://github.com/named-data/PSync
+
+Files: *
+Copyright: Copyright (c) 2014-2019 The University of Memphis
+
+License: LGPL-3+
+ PSync 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.
+ .
+ PSync 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
+ PSync, e.g., in COPYING.md file.  If not, see <http://www.gnu.org/licenses/>.
+
+Files: debian/*
+Copyright: 2019 Ashlesh Gawande <agawande@memphis.edu>
+License: Apache 2.0
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+ .
+     http://www.apache.org/licenses/LICENSE-2.0
+ .
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+ .
+ On Debian systems, the complete text of the Apache License 2.0 can
+ be found in "/usr/share/common-licenses/Apache-2.0"
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