Start on implementation of apps with multiple included bundles

Change-Id: I8fc8474d5f2ff1b45e0dccfbe3fc20e27cc9000b
diff --git a/apps/mcast/api/BUILD b/apps/mcast/api/BUILD
new file mode 100644
index 0000000..646cfb8
--- /dev/null
+++ b/apps/mcast/api/BUILD
@@ -0,0 +1,4 @@
+osgi_jar(
+    deps = CORE_DEPS,
+    visibility = ["//visibility:public"],
+)