Create usage example

webui/src/mainEnt.tsx

@@ -0,0 +1,29 @@
+import React from 'react';
+import { createRoot } from 'react-dom/client';
+
+// styles
+import 'bootstrap/dist/css/bootstrap.css';
+import './styles/globals.css';
+
+// app and plugins system
+import LakeFSApp from "./exported/lakefsApp";
+import { PluginManager } from "./exported/plugins/pluginManager";
+
+const pluginManager = new PluginManager();
+// Register a plugin
+const appTabsPlugin = {
+    tabs: [
+        {
+            id: 'extra-tab',
+            name: 'Extra Tab',
+            component: () => <div>Extra Tab Content</div>,
+        },
+    ],
+};
+pluginManager.registerPluginAppTabs(appTabsPlugin);
+
+const container = document.getElementById('root');
+if (!container) throw new Error("Failed to find root element!");
+
+const root = createRoot(container);
+root.render(<LakeFSApp pluginManager={pluginManager}/>);