Add link to online help documentation

CHANGELOG.md

@@ -9,6 +9,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/).
 
 ### Added
 
+- ![UI] Add link to online help documentation [#891](https://github.com/jdemetra/jdemetra-app/issues/891)
 - ![OTHER] Add Windows binaries to release [#885](https://github.com/jdemetra/jdemetra-app/issues/885)
 
 ### Fixed

nbdemetra-ui/src/main/java/internal/BrowseOnlineDocAction.java

@@ -0,0 +1,48 @@
+package internal;
+
+import ec.nbdemetra.ui.notification.NotifyUtil;
+import org.openide.awt.ActionID;
+import org.openide.awt.ActionReference;
+import org.openide.awt.ActionRegistration;
+import org.openide.nodes.Node;
+import org.openide.util.HelpCtx;
+import org.openide.util.NbBundle;
+import org.openide.util.actions.NodeAction;
+
+import java.awt.*;
+import java.io.IOException;
+import java.net.URI;
+
+@ActionID(category = "Help", id = BrowseOnlineDocAction.ID)
+@ActionRegistration(displayName = "#BrowseOnlineDocAction", lazy = false)
+@ActionReference(path = "Menu/Help", position = 200)
+@NbBundle.Messages("BrowseOnlineDocAction=Online Docs")
+public final class BrowseOnlineDocAction extends NodeAction {
+
+//    @ClassNameConstant
+    public static final String ID = "internal.BrowseOnlineDocAction";
+
+    @Override
+    public String getName() {
+        return Bundle.BrowseOnlineDocAction();
+    }
+
+    @Override
+    public HelpCtx getHelpCtx() {
+        return null;
+    }
+
+    @Override
+    protected void performAction(Node[] nodes) {
+        try {
+            Desktop.getDesktop().browse(URI.create("https://jdemetra-new-documentation.netlify.app/"));
+        } catch (IOException ex) {
+            NotifyUtil.error("Desktop", "Cannot browse uri", ex);
+        }
+    }
+
+    @Override
+    protected boolean enable(Node[] nodes) {
+        return Desktop.isDesktopSupported() && Desktop.getDesktop().isSupported(Desktop.Action.BROWSE);
+    }
+}