Add gerrit settings

This facilitate the use of "git review" command for gerrit submissions.

Change-Id: Ic2df30f053687b6d48232cf04ce22592e1e09a94
diff --git a/.gitreview b/.gitreview
new file mode 100644
index 0000000..b2b5d25
--- /dev/null
+++ b/.gitreview
@@ -0,0 +1,3 @@
+[gerrit]
+host=gerrit.osmocom.org
+project=cellmgr-ng