added readonly parameter

git-svn-id: https://svn.apache.org/repos/asf/maven/plugin-tools/trunk@1342912 13f79535-47bb-0310-9956-ffa450edef68

maven-plugin-plugin/src/it/help-basic/src/main/java/test/MyMojo.java

@@ -37,6 +37,14 @@ public class MyMojo
      */
     private String undocumentedParam;
 
+    /**
+     * Readonly parameter: should not be proposed for configuration.
+     *
+     * @parameter default-value="not for configuration"
+     * @readonly
+     */
+    private String readonly;
+
     public void execute()
     {
     }