Add debian packaging content

Change-Id: I2bcacca040364f77aa6b17edf53acf53c820c17b
diff --git a/debian/copyright b/debian/copyright
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--- /dev/null
+++ b/debian/copyright
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+Format: http://www.debian.org/doc/packaging-manuals/copyright-format/1.0/
+Upstream-Name: osmo-sysmon
+Source: git://git.osmocom.org/osmo-sysmon
+
+Files:     *
+Copyright: 2019 sysmocom s.f.m.c. GmbH <info@sysmocom.de>
+License:   GPL-2.0+
+ This program 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 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 General Public License for more details.
+ .
+ You should have received a copy of the GNU General Public License along
+ with this program; if not, write to the Free Software Foundation, Inc.,
+ 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ .
+ On Debian systems, the complete text of the GNU General Public License
+ Version 2 can be found in `/usr/share/common-licenses/GPL-2'.
+
+Files:     git-version-gen
+Copyright: 2007-2010 Free Software Foundation, Inc.
+License:   GPL-3.0+
+ This program 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.
+ .
+ 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 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/>.
+ .
+ This script is derived from GIT-VERSION-GEN from GIT: http://git.or.cz/.
+ It may be run two ways:
+ - from a git repository in which the "git describe" command below
+ produces useful output (thus requiring at least one signed tag)
+ - from a non-git-repo directory containing a .tarball-version file, which
+ presumes this script is invoked like "./git-version-gen .tarball-version".
+ .
+ In order to use intra-version strings in your project, you will need two
+ separate generated version string files:
+ .
+ .tarball-version - present only in a distribution tarball, and not in
+ a checked-out repository.  Created with contents that were learned at
+ the last time autoconf was run, and used by git-version-gen.  Must not
+ be present in either $(srcdir) or $(builddir) for git-version-gen to
+ give accurate answers during normal development with a checked out tree,
+ but must be present in a tarball when there is no version control system.
+ Therefore, it cannot be used in any dependencies.  GNUmakefile has
+ hooks to force a reconfigure at distribution time to get the value
+ correct, without penalizing normal development with extra reconfigures.
+ .
+ .version - present in a checked-out repository and in a distribution
+ tarball.  Usable in dependencies, particularly for files that don't
+ want to depend on config.h but do want to track version changes.
+ Delete this file prior to any autoconf run where you want to rebuild
+ files to pick up a version string change; and leave it stale to
+ minimize rebuild time after unrelated changes to configure sources.
+ .
+ It is probably wise to add these two files to .gitignore, so that you
+ don't accidentally commit either generated file.
+ .
+ Use the following line in your configure.ac, so that $(VERSION) will
+ automatically be up-to-date each time configure is run (and note that
+ since configure.ac no longer includes a version string, Makefile rules
+ should not depend on configure.ac for version updates).
+ .
+ On Debian systems, the complete text of the GNU General Public License
+ Version 3 can be found in `/usr/share/common-licenses/GPL-3'.