Added material to the BeyondFacts Lab (#1180)

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

@@ -0,0 +1,8 @@
+namespace AIStudio.Assistants.BeyondFactsLab;
+
+/// <summary>
+/// The part of a material which the prompt of a step carries.
+/// </summary>
+/// <param name="Share">How much of the material the prompt carries.</param>
+/// <param name="Text">The beginning of its text, or the whole text; empty when nothing of it fits.</param>
+public sealed record BflMaterialExcerpt(BflMaterialShare Share, string Text);