metrics: Add C-Ray README

This PR adds the C-Ray documentation at the README file. Signed-off-by: Gabriela Cervantes <gabriela.cervantes.tellez@intel.com>
kata-containers · Jul 18, 2023 · 98c1217 · 98c1217
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+# Kata Containers C-Ray Metrics
+This is a test of C-Ray which is a simple raytracer designed to test the floating-point CPU performance.
+
+## Running the C-Ray test
+Individual test can be run by hand, for example: 
+
+``` 
+$ cd metrics/disk/c-ray $ ./cray.sh
+```