Ajout exception partie déjà démarrée

SpringBootProject/src/main/java/fr/iut/sciencequest/sae/exceptions/PartyAlreadyStartedException.java

@@ -1,2 +1,12 @@
-package fr.iut.sciencequest.sae.exceptions;public class PartyAlreadyStartedException {
+package fr.iut.sciencequest.sae.exceptions;
+
+
+import org.springframework.http.HttpStatus;
+import org.springframework.web.bind.annotation.ResponseStatus;
+
+@ResponseStatus(HttpStatus.FORBIDDEN)
+public class PartyAlreadyStartedException extends RuntimeException {
+    public PartyAlreadyStartedException() {
+        super("Party already started");
+    }
 }