Add a new @Generated annotation (with class retention)

src/main/java/edu/hm/hafner/util/Generated.java

@@ -0,0 +1,25 @@
+package edu.hm.hafner.util;
+
+import java.lang.annotation.Retention;
+import java.lang.annotation.Target;
+
+import static java.lang.annotation.ElementType.*;
+import static java.lang.annotation.RetentionPolicy.*;
+
+/**
+ * This annotation is used to mark source code that has been generated or is somehow not relevant for style checking or
+ * code coverage analysis. This annotation is quite similar to the annotation @{@link javax.annotation.Generated}. The
+ * main difference is that it has class retention on so is available for tools that work on the bytecode (like JaCoCo,
+ * PIT, or SpotBugs).
+ */
+@Retention(CLASS)
+@Target({PACKAGE, TYPE, ANNOTATION_TYPE, METHOD, CONSTRUCTOR, FIELD,
+        LOCAL_VARIABLE, PARAMETER})
+public @interface Generated {
+    /**
+     * An optional property that identifies the code generator.
+     *
+     * @return the name of the generator
+     */
+    String[] value() default "";
+}