qpkg: added README and COPYING.GPLv2

qpkg/README

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+qpkg - Query package databases
+==============================
+
+qpkg is a tool that reads package databases of the kind used by opkg
+in OE-derived Jlime (which are very similar to what dpkg and apt use)
+and that can answer a number of queries on them.
+
+While being able to perform some of the database operations commonly
+found in package managers, qpkg is not a package manager itself. 
+However, it may be used to help a package manager do its work faster.
+
+
+Except for the files jrb.h and jrb.c, this work is distributed under
+the terms of the GNU GENERAL PUBLIC LICENSE, Version 2:
+
+  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.
+
+For your convenience, a copy of the complete license has been included
+in the file COPYING.GPLv2.
+
+
+The implementation of red-black trees, in jrb.h and jrb.c, is
+distributed under the terms of the GNU Lesser General Public License,
+Version 2.1:
+
+  This library is free software; you can redistribute it and/or
+  modify it under the terms of the GNU Lesser General Public
+  License as published by the Free Software Foundation; either
+  version 2.1 of the License, or (at your option) any later version.
+
+For your convenience, the original copyright notice accompanying JRB
+and a copy of the license have been included in the files READNE.jrb
+and LICENSE.jrb, respectively.
+
+
+Objectives
+----------
+
+The original motivation for qpkg comes from the observation that opkg
+consumes inordinate amounts of memory when determining the
+prerequisites for installing a package on a given system, and the
+proof of concept implementation of a shell script wrapper by Rafael
+Zurita, that performs a large subset of the same task with much less
+overhead.
+
+qpkg thus aims to load and parse large package databases as quickly
+and memory-efficiently as possible, and to provide a number of query
+functions that operate on the data.
+
+A second objective is to provide a means to test the integrity of a
+package database, and to perform simple "what if" queries, e.g., to
+test which packages would become uninstallable if a package was to be
+removed or a conflict was to be introduced.
+
+This is to aid not only in general housekeeping of package databases,
+but also to assist in generating - at the package level - restricted
+distributions derived from a master distribution.