Ground work for Wino Calendar. (#475)

Wino Calendar abstractions.

Wino.Calendar/Styles/CalendarItemControlResources.xaml

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+<ResourceDictionary
+    x:Class="Wino.Calendar.Styles.CalendarItemControlResources"
+    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+    xmlns:controls="using:Wino.Calendar.Controls">
+
+    <!--  CalendarItemControl  -->
+    <Style TargetType="controls:CalendarItemControl">
+        <Style.Setters>
+            <Setter Property="Template">
+                <Setter.Value>
+                    <ControlTemplate TargetType="controls:CalendarItemControl">
+                        <Grid
+                            Margin="1,1,1,1"
+                            Background="#cf2b36"
+                            BorderBrush="Gray"
+                            CornerRadius="3">
+                            <TextBlock
+                                HorizontalAlignment="Center"
+                                VerticalAlignment="Center"
+                                Text="{x:Bind Item.Name, Mode=OneWay}" />
+                        </Grid>
+                    </ControlTemplate>
+                </Setter.Value>
+            </Setter>
+        </Style.Setters>
+    </Style>
+
+</ResourceDictionary>