Add Transport-API Yang models.

Change-Id: Iaca69b8bd1adbd899b0b6faf255f2e202a80a927
diff --git a/models/pom.xml b/models/pom.xml
index e45e5ad..5d2287a 100644
--- a/models/pom.xml
+++ b/models/pom.xml
@@ -35,6 +35,7 @@
         <module>openconfig</module>
         <module>openroadm</module>
         <module>l3vpn</module>
+        <module>tapi</module>
     </modules>
 
 </project>