add workshop announcement [ci skip]
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mwengren/pycsw,tomkralidis/pycsw,ricardogsilva/pycsw,mwengren/pycsw,tomkralidis/pycsw,ricardogsilva/pycsw,kalxas/pycsw,benhowell/pycsw,ingenieroariel/pycsw,rouault/pycsw,bukun/pycsw,PublicaMundi/pycsw,ckan-fcd/pycsw-fcd,kalxas/pycsw,geopython/pycsw,ocefpaf/pycsw,rouault/pycsw,kalxas/pycsw,kevinpdavies/pycsw,benhowell/pycsw,ocefpaf/pycsw,ingenieroariel/pycsw,geopython/pycsw,bukun/pycsw,ckan-fcd/pycsw-fcd,bukun/pycsw,PublicaMundi/pycsw,kevinpdavies/pycsw,geopython/pycsw,tomkralidis/pycsw,ricardogsilva/pycsw