Adding Bazel BUILD files for yang subsystem.

Change-Id: I957cc95d56eb2ddf6906fa4a396ce2556b9b5e86
diff --git a/apps/yang/BUILD b/apps/yang/BUILD
new file mode 100644
index 0000000..d284902
--- /dev/null
+++ b/apps/yang/BUILD
@@ -0,0 +1,30 @@
+COMPILE_DEPS = CORE_DEPS + JACKSON + CLI + ONOS_YANG + [
+  "//core/common:onos-core-common",
+  "@onos_yang_runtime//jar",
+]
+
+BUNDLES = ONOS_YANG + [
+  "@onos_yang_runtime//jar",
+  "//apps/yang:onos-apps-yang",
+  "//apps/yang/web:onos-apps-yang-web",
+  "@org_apache_servicemix_bundles_dom4j//jar",
+]
+
+EXCLUDED_BUNDLES = [
+]
+
+osgi_jar_with_tests(
+  deps = COMPILE_DEPS,
+)
+
+onos_app(
+  category = "Utility",
+  description = "Provides ability to register compiled YANG models or even to compile YANG source " +
+    "files on the fly. Registering YANG models allows other ONOS subsystems to interact with " +
+    "orchestrators or individual network devices using XML or JSON data structured in accordance " +
+    "with those models.",
+  included_bundles = BUNDLES,
+  excluded_bundles = EXCLUDED_BUNDLES,
+  title = "YANG Compiler and Runtime",
+  url = "http://onosproject.org",
+)