Update README.md

Author: pietercolpaert

README.md

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 # linked-datex2
-An RDF ontology for the Linked Datex2 specification
+This repository contains a historical (deprecated) prototype of an early RDF ontology for the Datex2 specification
+
+A Linked Data mapping has now been adopted by the Datex standardization group itself over here:
+
+ * https://datex2.eu/vocab/3/Common/ 
+ * https://datex2.eu/vocab/3/D2Payload/ 
+ * https://datex2.eu/vocab/3/LocationReferencing/ 
+ * https://datex2.eu/vocab/3/Situation/ 
+ * https://datex2.eu/vocab/3/RoadTrafficData/ 
+ * https://datex2.eu/vocab/3/Vms/