Added RestServer + Added Create User (/users)

src/test/java/CardTest.java

@@ -1,3 +1,7 @@
+import at.reisinger.Card;
+import at.reisinger.CardType;
+import at.reisinger.EffectivnessType;
+import at.reisinger.ElementTyp;
 import org.junit.jupiter.api.Test;
 
 import static org.junit.jupiter.api.Assertions.assertTrue;