add utility method for graphql queries

src/main/java/de/unistuttgart/iste/meitrex/common/util/GraphQlUtil.java

@@ -0,0 +1,19 @@
+package de.unistuttgart.iste.meitrex.common.util;
+
+import lombok.NoArgsConstructor;
+import org.intellij.lang.annotations.Language;
+
+@NoArgsConstructor(access = lombok.AccessLevel.PRIVATE)
+public class GraphQlUtil {
+
+    /**
+     * This method is used to mark a string as a GraphQl.
+     * This is useful for IntelliJ IDEA to provide syntax highlighting and code completion.
+     *
+     * @param graphQl the GraphQl string
+     * @return the GraphQl string
+     */
+    public static String gql(@Language("GraphQl") final String graphQl) {
+        return graphQl;
+    }
+}