Adding example Multicast Route Json files

Change-Id: I47b0661cd56df0b991f727512b3c50f8c238671c
(cherry picked from commit 29e5e11907407b4fa03ef9a199b35ee76092ee7d)
diff --git a/apps/mcast/web/src/main/resources/jsonExamples/mcastSources.json b/apps/mcast/web/src/main/resources/jsonExamples/mcastSources.json
new file mode 100644
index 0000000..6277b56
--- /dev/null
+++ b/apps/mcast/web/src/main/resources/jsonExamples/mcastSources.json
@@ -0,0 +1,5 @@
+{
+  "sources": [
+    "of:0000000000000206/8"
+  ]
+}
\ No newline at end of file