Add CDF readme

examples/oml/CDF/README.md

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+# Vocabularies for CDF project
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+This directory contains a Rosetta project with vocabularies for the Flanders Make CDF traceability-demo (AGV use case).
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+There are also a bunch of OML descriptions and SPARQL queries to check if the vocabularies are defined correctly.
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+It is currently developed independently from the vocabularies under sdo2l, although at some point we could merge the two.