Implemented enums

server/core/src/main/java/fr/univnantes/software_engineering/enums/BonusItem.java

+package fr.univnantes.software_engineering.enums;
+
+public enum BonusItem
+{
+    VICTORY_POINT,
+    CONFLICT_POINT,
+    TABLET_SYMBOL,
+    RULERS_SYMBOL,
+    GEAR_SYMBOL
+}

server/core/src/main/java/fr/univnantes/software_engineering/enums/CardColor.java

+package fr.univnantes.software_engineering.enums;
+
+public enum CardColor
+{
+    RED,
+    BLUE,
+    BROWN,
+    GRAY,
+    YELLOW,
+    GREEN
+}

server/core/src/main/java/fr/univnantes/software_engineering/enums/CostItem.java

+package fr.univnantes.software_engineering.enums;
+
+public enum CostItem
+{
+    MONEY
+}

server/core/src/main/java/fr/univnantes/software_engineering/enums/LookAt.java

+package fr.univnantes.software_engineering.enums;
+
+public enum LookAt
+{
+    RIGHT,
+    LEFT,
+    ITSELF
+}