Setup the basic Catalog panel

src/main/java/world/bentobox/bentobox/panels/CatalogPanel.java

@@ -1,6 +1,10 @@
 package world.bentobox.bentobox.panels;
 
+import org.bukkit.Material;
 import org.eclipse.jdt.annotation.NonNull;
+import world.bentobox.bentobox.BentoBox;
+import world.bentobox.bentobox.api.panels.builders.PanelBuilder;
+import world.bentobox.bentobox.api.panels.builders.PanelItemBuilder;
 import world.bentobox.bentobox.api.user.User;
 
 /**
@@ -9,7 +13,23 @@ import world.bentobox.bentobox.api.user.User;
  */
 public class CatalogPanel {
 
+    private static final String LOCALE_REF = "catalog.panel.";
+    private static final int[] PANES = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 17, 18, 26, 27, 35, 36, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53};
+
+    private CatalogPanel() {}
+
     public static void openPanel(@NonNull User user) {
-        user.sendRawMessage("open the catalog (it's coming soon!)");
+        BentoBox plugin = BentoBox.getInstance();
+
+        PanelBuilder builder = new PanelBuilder()
+                .name(user.getTranslation(LOCALE_REF + "title"))
+                .size(54);
+
+        // Setup header and corners
+        for (int i : PANES) {
+            builder.item(i, new PanelItemBuilder().icon(Material.LIGHT_BLUE_STAINED_GLASS_PANE).name(" ").build());
+        }
+
+        builder.build().open(user);
     }
 }

src/main/resources/locales/en-US.yml

@@ -1022,6 +1022,10 @@ management:
             &cWeird behaviour and bugs can occur
             &cand most features may be unstable.
 
+catalog:
+  panel:
+    title: "Addons Catalog"
+
 successfully-loaded: |
 
   &6  ____             _        ____