Add .gitreview config.

Change-Id: Iee2cffccfcb5c46e2b53784d985d3b4cfe122f2a
Reviewed-on: http://gerrit.dmdirc.com/4020
Reviewed-by: Greg Holmes <greg@dmdirc.com>
Automatic-Compile: DMDirc Build Manager

.gitreview

@@ -0,0 +1,5 @@
+[gerrit]
+host=dmdirc.com
+port=29418
+project=util
+defaultbranch=master