added readme

diff --git a/iif/ctl/README b/iif/ctl/README
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+To convert an ACES (linear) image into something suitable for display, you must apply
+both the rrt and device specific ODT.
+
+Example:
+
+ctlrender -ctl rrt_ut11.ctl -ctl odt_ut11_sRGB.ctl <INPUT_LATTICE_ACES_IMAGE.exr> <OUTPUT_RENDERED_IMAGE.exr>