add floating button

covas_mobile/lib/pages/ItemMenu.dart

@@ -394,6 +394,14 @@ class _ItemMenuState extends State<ItemMenu> with ShowErrorDialog {
               ],
             )
           ],
-        )));
+        ),
+      ),
+      floatingActionButton: FloatingActionButton(
+        onPressed: () {},
+        backgroundColor: Colors.blue,
+        tooltip: 'Recherche',
+        child: const Icon(Icons.edit, color: Colors.white),
+      ),
+    );
   }
 }