account: add RING/SIP accounts

- adds the ability to add accounts from within the accounts menu

Change-Id: Ic2bd21f8c08e0e159c1006409eaaf815b7748bc8
Tuleap: #996
diff --git a/Styles.xaml b/Styles.xaml
index 9afeebe..3a87cd9 100644
--- a/Styles.xaml
+++ b/Styles.xaml
@@ -115,6 +115,19 @@
         <Setter Property="Background"

                 Value="LightBlue"/>

     </Style>

+    <Style x:Key="ButtonStyle5"

+        TargetType="Button">

+        <Setter Property="Width"

+            Value="160"/>

+        <Setter Property="Height"

+            Value="30"/>

+        <Setter Property="FontFamily"

+            Value="Segoe MDL2 Assets"/>

+        <Setter Property="Foreground"

+            Value="White"/>

+        <Setter Property="Background"

+            Value="Transparent"/>

+    </Style>

     <Style x:Key="ToggleButtonStyle1"

            TargetType="ToggleButton">

         <Setter Property="Width"