add sdg and sdgTarget to classificationScheme codelist

schema/codelists/classificationScheme.csv

@@ -14,3 +14,5 @@ CELEX,CELEX number,Identifier scheme for EUR-Lex documents,https://eur-lex.europ
 LEXML,LexML URN,Identifier scheme for BR-Lex documents,https://projeto.lexml.gov.br/,legalBasis
 COFOG,Classification of the Functions of Government,"A standard classifying the purposes of government activities, developed by the Organisation for Economic Co-operation and Development and published by the United Nations Statistical Division.",https://unstats.un.org/unsd/classifications/Econ/,organization
 proClass,ProClass,ProClass is a procurement classification scheme intended for use by local government in the United Kingdom.,https://proclass.org.uk/,item
+sdg,Sustainable Development Goals,"The Sustainable Development Goals are a collection of 17 interlinked goals set by the United Nations General Assembly and designed to be a ""blueprint to achieve a better and more sustainable future for all"".",https://unstats.un.org/sdgs/indicators/indicators-list/,purpose
+sdgTarget,Sustainable Development Goal Targets,The Sustainable Development Goal Targets are specific targets for each Sustainable Development Goal.,https://unstats.un.org/sdgs/indicators/indicators-list/,purpose