[Radioig] First release of the implementation note

[BONNAREL FRANCOIS]

Dear all,

The first release of our radio astronomy in the VO implementation note 
has been released as an ivoa note. Thanks to all contributors.

https://www.ivoa.net/documents/Notes/RadioVOImp/

This note will be shortly presented during the interoperability meeting 
RadioIG session.

A github project will be soon opened for raising issues and propose PR

Cheers

François and Mark