multicast-test: multicast scenario

Refs: #1390

Change-Id: I28c713e1511618c3b708342227e858cfb0dfc08e
diff --git a/test_multicast/README.md b/test_multicast/README.md
new file mode 100644
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+# Multicast test scenario
+
+Test UDP and Ethernet multicast faces.
+
+1.  Start NFD on A, B, and C.
+2.  On host A, insert FIB entry `ndn:/test-mcast` to either UDP or Ethernet multicast face on experiment NIC.
+3.  On host B, start traffic generator producer to serve `ndn:/test-mcast/B`, `ndn:/test-mcast/Z`.
+4.  On host C, start traffic generator producer to serve `ndn:/test-mcast/C`, `ndn:/test-mcast/Z`.
+5.  On host A, invoke `ndn-tlv-peek ndn:/test-mcast/B/1`.
+    Fail the test if this Interest is unanswered.
+6.  On host A, invoke `ndn-tlv-peek ndn:/test-mcast/C/1`.
+    Fail the test if this Interest is unanswered.
+7.  On host A, invoke `ndn-tlv-peek ndn:/test-mcast/Z/1`.
+    Fail the test if this Interest is unanswered.
+8.  On host B, kill the producer.
+9.  On host A, invoke `ndn-tlv-peek ndn:/test-mcast/Z/2`.
+    Fail the test if this Interest is unanswered.