Added material to the BeyondFacts Lab (#1180)

app/MindWork AI Studio/Assistants/BeyondFactsLab/BflRequestMaterial.cs

@@ -0,0 +1,10 @@
+using AIStudio.Chat;
+
+namespace AIStudio.Assistants.BeyondFactsLab;
+
+/// <summary>
+/// What a request of a chat of the lab carries beside the conversation.
+/// </summary>
+/// <param name="SystemPrompt">The system prompt, with the text of the material.</param>
+/// <param name="Images">The images of the material which go along with the first message of the conversation.</param>
+public sealed record BflRequestMaterial(string SystemPrompt, IReadOnlyList<FileAttachmentImage> Images);