Add GPL version 3 license text to About dialog.

diylc/diylc-swing/src/org/diylc/swing/plugins/help/HelpMenuPlugin.java

@@ -82,12 +82,24 @@ public class HelpMenuPlugin implements IPlugIn {
   @Override
   public void processMessage(EventType eventType, Object... params) {}
 
+
+  private static final String LICENSE_TEXT = "<p>This program is free software: you can redistribute it and/or modify" +
+    " it under the terms of the GNU General Public License as published by" +
+    " the Free Software Foundation, either version 3 of the License, or" +
+    " (at your option) any later version.</p>" +
+    "<p>This program is distributed in the hope that it will be useful," +
+    " but WITHOUT ANY WARRANTY; without even the implied warranty of" +
+    " MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the" +
+    " GNU General Public License for more details.</p>" +
+    "<p>You should have received a copy of the GNU General Public License" +
+    " along with this program.  If not, see <a href=\"https://www.gnu.org/licenses\">https://www.gnu.org/licenses</a>.</p>";
   private AboutDialog getAboutDialog() {
     if (aboutDialog == null) {
       aboutDialog =
           DialogFactory.getInstance().createAboutDialog("DIY Layout Creator", IconLoader.IconLarge.getIcon(),
               plugInPort.getCurrentVersionNumber().toString(), "Branislav Stojkovic",
-              "github.com/bancika/diy-layout-creator", "bancika@gmail.com", "");
+              "github.com/bancika/diy-layout-creator", "bancika@gmail.com", LICENSE_TEXT);
+      aboutDialog.setSize(aboutDialog.getSize().width + 30, aboutDialog.getSize().height + 200);
     }
     return aboutDialog;
   }