add MaxMemberException

Co-Authored-By: andibuls <andibuls@users.noreply.github.com>
Co-Authored-By: Lukas Ettel <lukasettel@users.noreply.github.com>

src/main/java/mops/gruppen2/domain/exception/NoMaximumMemberException.java

@@ -0,0 +1,10 @@
+package mops.gruppen2.domain.exception;
+
+import org.springframework.http.HttpStatus;
+
+public class NoMaximumMemberException extends EventException {
+
+	public NoMaximumMemberException(String info) {
+		super(HttpStatus.INTERNAL_SERVER_ERROR, "Es wurde keine maximale Gruppenanzahl festgelegt", info);
+	}
+}