Add GameType Entity, Service and Repository. Test add GameType done.

src/main/java/fr/eni/demo/bll/GameTypeService.java

@@ -0,0 +1,17 @@
+package fr.eni.demo.bll;
+
+import fr.eni.demo.bo.GameType;
+import fr.eni.demo.dal.GameTypeRepository;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+
+@Service
+public class GameTypeService {
+
+  @Autowired
+  private GameTypeRepository gameTypeRepository;
+
+  public void add(GameType gameType) {
+    gameTypeRepository.save(gameType);
+  }
+}