add shortcuts panel

data/dialogs/shortcuts.xml

@@ -0,0 +1,38 @@
+<?xml version="1.0"?>
+<root
+  xmlns="http://panopainter.com/layout.xsd"
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+>
+  <layout id="item">
+    <border color="1 0 0 1" dir="row">
+      <node grow="1">
+        <text id="descr" font-size="30">New File</text>
+      </node>
+      <node width="100">
+        <text id="shortcut" font-size="30">Ctrl + N</text>
+      </node>
+    </border>
+  </layout>  
+  
+  <layout id="shortcuts">
+    <border positioning="absolute" position="0 0" color=".4 .4 .4 .8" width="100%" height="100%" align="center" justify="center" mouse-capture="1">
+      <border thickness="1" border-color=".2" pad="3" max-width="650" dir="col" width="80%" height="80%">
+        <border width="100%" height="30" color=".2 .2 .2 .9" dir="row" align="center" justify="center">
+          <text>Shortcuts</text>
+        </border>
+        <border width="100%" height="100%" color="0 0 0 .9" pad="10" dir="col">
+          <!--window content-->
+          <border color=".2" width="100%" height="1" grow="1">
+            <scroll id="content" pad="10" margin="5" color=".3 .3 .3 .4" height="100%" dir="col" wrap="0" shrink="1">
+            </scroll>
+          </border>
+          <!--footer buttons-->
+          <node id="footer" height="60" dir="row" justify="flex-end">
+            <button id="btn-ok" text="Ok" width="100" height="30" margin="5 0 0 0"/>
+          </node>
+        </border>
+      </border>
+    </border>
+  </layout>
+
+</root>