refactor: Category, ExampleFeedback, Peer2PeerFeedback (little changes)

gemeinsamforschen/src/main/java/unipotsdam/gf/modules/peer2peerfeedback/Category.java → gemeinsamforschen/src/main/java/unipotsdam/gf/core/management/utils/Category.java

-package unipotsdam.gf.modules.peer2peerfeedback;
+package unipotsdam.gf.core.management.utils;
 
 /**
  Categories for feedback and documents
@@ -6,5 +6,6 @@ package unipotsdam.gf.modules.peer2peerfeedback;
  */
 
 public enum Category {
-    RECHERCHE, FORSCHUNGSFRAGE, UNTERSUCHUNGSKONZEPT, METHODIK, DURCHFUEHRUNG, AUSWERTUNG
+    TITEL, RECHERCHE, LITERATURVERZEICHNIS, FORSCHUNGSFRAGE, UNTERSUCHUNGSKONZEPT, METHODIK, DURCHFUEHRUNG, AUSWERTUNG
 }
+ //Lernziele??
\ No newline at end of file

gemeinsamforschen/src/main/java/unipotsdam/gf/modules/peer2peerfeedback/ExampleFeedback.java

 package unipotsdam.gf.modules.peer2peerfeedback;
 
 import unipotsdam.gf.core.management.user.User;
+import unipotsdam.gf.core.management.utils.Category;
+
 import java.io.File;
 
 /**

gemeinsamforschen/src/main/java/unipotsdam/gf/modules/peer2peerfeedback/Peer2PeerFeedback.java

 package unipotsdam.gf.modules.peer2peerfeedback;
 
 import unipotsdam.gf.core.management.user.User;
+import unipotsdam.gf.core.management.utils.Category;
+
 import java.io.File;
 
 /**