Add repo mailing list to pom file

Since this project is now maintained by the Gerrit
community, it makes sense for discussion to
happen on the repo list.

Change-Id: Iedcd3810995823dc8e7ee06579542b3afb065ee3

pom.xml

diff --git a/pom.xml b/pom.xml
index 5f1a752..cf158e2 100644
--- a/pom.xml
+++ b/pom.xml
@@ -9,6 +9,14 @@
   <version>1.3-SNAPSHOT</version>
   <name>Prolog Cafe</name>
 
+  <mailingLists>
+    <mailingList>
+      <name>repo-discuss mailing list</name>
+      <post>repo-discuss@googlegroups.com</post>
+      <archive>https://groups.google.com/group/repo-discuss/about</archive>
+    </mailingList>
+  </mailingLists>
+
   <build>
     <sourceDirectory>java_src</sourceDirectory>