Ground work for Wino Calendar. (#475)

Wino Calendar abstractions.

Wino.Messages/Client/Calendar/CalendarInitializeMessage.cs

@@ -0,0 +1,13 @@
+using System;
+using Wino.Core.Domain.Enums;
+
+namespace Wino.Messaging.Client.Calendar
+{
+    /// <summary>
+    /// Raised when a new calendar range is requested for drawing.
+    /// </summary>
+    /// <param name="DisplayType">Type of the calendar.</param>
+    /// <param name="DisplayDate">Exact date to highlight.</param>
+    /// <param name="DayDisplayCount">How many days to load with Day calendar display type.</param>
+    public record CalendarInitializeMessage(DateTime DisplayDate, CalendarInitInitiative CalendarInitInitiative);
+}