Refactor Category and Link Repository to use generic the persistence adapter

1-Adapter/src/main/java/persistence/CSVCategoryPersistenceAdapter.java

@@ -1,17 +1,22 @@
 package persistence;
 
+import abstraction.PersistenceAdapter;
 import category.Category;
-import category.CategoryPersistenceAdapter;
 
 import java.util.Set;
 
-public class CSVCategoryPersistenceAdapter implements CategoryPersistenceAdapter {
+public class CSVCategoryPersistenceAdapter implements PersistenceAdapter<Category> {
 
 	@Override
 	public Set<Category> getAll() {
 		return null;
 	}
 
+	@Override
+	public Boolean remove(Category value) {
+		return null;
+	}
+
 	@Override
 	public Boolean add(Category category) {
 		return null;