Update README.md

README.md

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 This repository contains OpenAPIs descriptions for the interfaces specified in ETSI MEC GS 028 "MEC WLAN Information API".
 
+More information and download options for the specification are available
+[here](https://portal.etsi.org/webapp/WorkProgram/Report_WorkItem.asp?WKI_ID=53995).
+
+**{-NOTE: The OpenAPI definitions are under development. The API as defined in GS MEC 028 takes precedence.-}**
+
 ## License
 
 Unless specified otherwise, the content of this repository and the files contained are released under the BSD-3-Clause license.