Added files from the example:
http://simmesimme.github.io/lessons/2011/11/02/ppa-launchpad-cmake/
after slight change in order to make launchpad compile gr-gsm.
diff --git a/debian/changelog b/debian/changelog
new file mode 100644
index 0000000..2f7a22b
--- /dev/null
+++ b/debian/changelog
@@ -0,0 +1,5 @@
+gr-gsm (0.3-0ppa0) xenial; urgency=low
+
+  * Initial upload!
+
+ -- Piotr Krysik <ptrkrysik@gmail.com>  Sun, 24 Apr 2016 16:00:00 +0100