Add .gitreview file

Change-Id: I05fcaaebe4566093894fc6abdee705c955ec4a09
diff --git a/.gitreview b/.gitreview
new file mode 100644
index 0000000..95d1a31
--- /dev/null
+++ b/.gitreview
@@ -0,0 +1,4 @@
+[gerrit]
+host=gerrit.sqlalchemy.org
+project=zzzeek/mako
+defaultbranch=master