Added ABOUT window

data/interface/wabout.ui

@@ -0,0 +1,41 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!-- Generated with glade 3.16.1 -->
+<interface>
+  <requires lib="gtk+" version="3.10"/>
+  <object class="GtkAboutDialog" id="about_devedeng">
+    <property name="can_focus">False</property>
+    <property name="resizable">False</property>
+    <property name="modal">True</property>
+    <property name="window_position">center</property>
+    <property name="type_hint">dialog</property>
+    <property name="has_resize_grip">False</property>
+    <property name="program_name">Devede NG</property>
+    <property name="copyright" translatable="yes">2014 Raster Software Vigo</property>
+    <property name="authors">Sergio Costas Rodríguez</property>
+    <property name="logo">devede.png</property>
+    <property name="logo_icon_name"/>
+    <property name="license_type">gpl-3-0</property>
+    <child internal-child="vbox">
+      <object class="GtkBox" id="aboutdialog-vbox1">
+        <property name="can_focus">False</property>
+        <property name="orientation">vertical</property>
+        <property name="spacing">2</property>
+        <child internal-child="action_area">
+          <object class="GtkButtonBox" id="aboutdialog-action_area1">
+            <property name="can_focus">False</property>
+            <property name="layout_style">end</property>
+          </object>
+          <packing>
+            <property name="expand">False</property>
+            <property name="fill">True</property>
+            <property name="pack_type">end</property>
+            <property name="position">0</property>
+          </packing>
+        </child>
+        <child>
+          <placeholder/>
+        </child>
+      </object>
+    </child>
+  </object>
+</interface>

data/interface/wmain.ui

@@ -159,6 +159,7 @@
                         <property name="can_focus">False</property>
                         <property name="use_underline">True</property>
                         <property name="use_stock">True</property>
+                        <signal name="activate" handler="on_about_activate" swapped="no"/>
                       </object>
                     </child>
                   </object>