nrd-test: Add test case for NRD

Refs: #1381

Change-Id: I1a195552ce93ea43f59831c39d708e6c22455ca8
diff --git a/test_nrd/README.md b/test_nrd/README.md
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+Test correctness of NRD prefix registration and FIB updates (without ForwardingFlags processing).
+
+1. Modify $HOME/.ndn/client.conf to choose "protocol=nrd-0.1".
+2. Start NFD and NRD.
+3. Run nfd-status to obtain FIB.
+4. Start ndn-traffic-server; configuration has one or more non-overlapping prefixes.
+5. Run nfd-status to obtain FIB. Compare new FIB to the FIB from step 3, and determine whether FIB entry is inserted
+6. Stop ndn-traffic-server.
+7. Run nfd-status to obtain FIB. Compare new FIB to the FIB from step 5, and determine whether FIB entry is deleted