Created README files for CHO, FUNC, and SCPF tests

Change-Id: I03dac9d76ea0a7eb3007a289325eb9bd954c759d
diff --git a/TestON/tests/SCPFmaxIntents/README b/TestON/tests/SCPFmaxIntents/README
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+Summary:
+        This is a performance test suit, designed to test the upper limits
+        of onos and ovsdb with respect to installing intents and rerouting flows.
+NOTE:
+        This test is largely based on the hardware used to run onos and mininet.
+        Therefore, results will very test station to test station.