add tooltips in headerbar

Author: ranfdev

src/window.ui

@@ -36,13 +36,15 @@
                                   <object class="GtkButton" id="create_distrobox_btn">
                                     <property name="icon-name">list-add-symbolic</property>
                                     <property name="action-name">win.create-distrobox</property>
+                                    <property name="tooltip-text" translatable="yes">Create Distrobox</property>
                                   </object>
                                 </child>
                                 <child type="end">
                                   <object class="GtkMenuButton">
                                     <property name="primary">True</property>
                                     <property name="menu-model">primary_menu</property>
                                     <property name="icon_name">open-menu-symbolic</property>
+                                    <property name="tooltip-text" translatable="yes">Main Menu</property>
                                   </object>
                                 </child>
                               </object>