Added the visual briefing assistant (#893)

app/MindWork AI Studio/Assistants/VisualBriefing/VisualBriefingAlignment.cs

@@ -0,0 +1,22 @@
+using System.Text.Json.Serialization;
+
+namespace AIStudio.Assistants.VisualBriefing;
+
+/// <summary>
+/// Identifies an allowed cross-axis alignment in the presentation layout.
+/// </summary>
+[JsonConverter(typeof(JsonStringEnumConverter<VisualBriefingAlignment>))]
+public enum VisualBriefingAlignment
+{
+    /// <summary>Aligns content at the start edge.</summary>
+    START,
+    
+    /// <summary>Centers content.</summary>
+    CENTER,
+    
+    /// <summary>Aligns content at the end edge.</summary>
+    END,
+    
+    /// <summary>Stretches content across the available space.</summary>
+    STRETCH,
+}