Add README.source detailing import of new upstream versions

diff --git a/debian/README.source b/debian/README.source
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+solvespace for Debian
+=====================
+
+solvespace upstream embeds various gitmodules. The sourcetree is patched
+to build with the packaged versions of all relevant libraries; except for
+libdxfrw. Since that can't be easily devendored, it is included in a component
+tarball. The source tree is patched to expect it under libdxfrw 
+(rather than extlib/libdxfrw).
+
+Importing new upstream releases
+==============================
+
+$ uscan -d
+which will create solvespace_3.x+dfsg.orig.tar.gz and solvespace_3.x+dfsg.orig+libdxfrw.tar.gz
+Then import the new tarball manually:
+$ gbp import-orig ../solvespace_3.x+dfsg.orig.tar.gz
+
+
+ -- Matthias Geiger <werdahias@debian.org>