Created README files for CHO, FUNC, and SCPF tests

Change-Id: I03dac9d76ea0a7eb3007a289325eb9bd954c759d
diff --git a/TestON/tests/FUNCoptical/README b/TestON/tests/FUNCoptical/README
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+Summary:
+        This test suite consist of basic optical functionality testing.
+        It bings up Link-OE topology to simulate optical switches.
+        The following is an overview of the basic functionality that is
+        performed in this test.
+        Steps:
+            - Discover hosts
+            - Compare Mininet topology
+            - Add and test point intents
+            - Add and test host intents
+