openAPI documentation for user WIP

Still nonfunctional update and missing tests

core/src/main/java/cz/muni/fi/pa165/core/common/DomainMapper.java

 package cz.muni.fi.pa165.core.common;
 
 import cz.muni.fi.pa165.model.dto.common.DomainObjectDto;
+import cz.muni.fi.pa165.model.dto.common.Result;
+import org.mapstruct.Mapping;
+import org.mapstruct.Mappings;
+import org.springframework.data.domain.Page;
 
 import java.util.List;
 
@@ -12,7 +16,6 @@ public interface DomainMapper<T extends DomainObject, S extends DomainObjectDto>
 
   List<S> toDtoList(List<T> entities);
 
-  /*
   @Mappings({
   		@Mapping(target = "total", expression = "java(source.getTotalElements())"),
   		@Mapping(target = "page", expression = "java(source.getNumber())"),
@@ -20,5 +23,5 @@ public interface DomainMapper<T extends DomainObject, S extends DomainObjectDto>
   		@Mapping(target = "items", expression = "java(toDtoList(source.getContent()))")
   })
   Result<S> toResult(Page<T> source);
-     */
+
 }