Update CommunityProjects.md
Update CommunityProjects.md

Adding `Decodable` mapping community extension to the readme
justinmakaila/Moya,ashfurrow/Moya,calt/Moya,Moya/Moya,Moya/Moya,justinmakaila/Moya,ashfurrow/Moya,justinmakaila/Moya,calt/Moya,calt/Moya,Moya/Moya