Added a way to read what the AI received from your sources (#1100)

Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/MindWork AI Studio/Tools/RAG/LocationRange.cs

@@ -0,0 +1,15 @@
+namespace AIStudio.Tools.RAG;
+
+/// <summary>
+/// Where a passage is in its document, counted from one: the pages it spans, or the part it is of a
+/// document without pages.
+/// </summary>
+/// <param name="First">The page the passage starts on, or its part.</param>
+/// <param name="Last">The page the passage ends on; the first one again when it stays on one, and always for a part.</param>
+public readonly record struct LocationRange(int First, int Last)
+{
+    /// <summary>
+    /// The range as it is written, e.g., "4" or "4–5".
+    /// </summary>
+    public override string ToString() => this.First == this.Last ? $"{this.First}" : $"{this.First}–{this.Last}";
+}