SWDEV-439716 - add readme in perftests redirecting user to actual folder

Change-Id: Id317a2ca7ad94663832661db62d0d10d1dc5b638


[ROCm/hip-tests commit: c971a816d9]

projects/hip-tests/perftests/README.md

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+# Performance tests
+
+These tests are in process of being ported to Catch framework [here](../catch/perftests/).
+
+Do not try to compile these as these might fail due to absence of some critical components. If you are interested in performance tests you can try to compile the one's in catch/perftests.