add new explaining LICENSE file

git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@765 fefdeb5f-60dc-0310-8127-8f9354f1896f

LICENSE

+All Polypaudio sources are licensed under the GNU Lesser General Public
+License. (see file LGPL for details)
+
+However, the server side links to the GPL-only library 'libsamplerate' which
+downgrades the license of the server part to GPL (see file GPL for details),
+exercising section 3 of the LGPL.
+
+Hence you should treat the client library ('libpolyp') of Polypaudio as being
+LGPL licensed and the server part ('libpolypcore') as being GPL licensed.
+
+-- Lennart Poettering, April 20th, 2006.