Make OpenROADM project importable on Eclipse.

- to accomodate AT&T's request.
  - added required pom.xml for OpenROADM

Change-Id: I502ae52fe2e7678b6c1b15970401ccbd3a8489e7
diff --git a/apps/pom.xml b/apps/pom.xml
index f6edde0..ad946b9 100644
--- a/apps/pom.xml
+++ b/apps/pom.xml
@@ -85,6 +85,7 @@
         <module>mappingmanagement</module>
         <module>network-troubleshoot</module>
         <module>restconf</module>
+        <module>yang</module>
     </modules>
 
     <properties>