Add exceptions for csv errors

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

@@ -0,0 +1,9 @@
+package mops.gruppen2.domain.exception;
+
+import org.springframework.http.HttpStatus;
+
+public class WrongFileException extends EventException {
+    public WrongFileException(String info) {
+        super(HttpStatus.INTERNAL_SERVER_ERROR, "Die entsprechende Datei ist keine valide CSV-Datei!", info);
+    }
+}