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/PassageLocation.cs

@@ -0,0 +1,26 @@
+namespace AIStudio.Tools.RAG;
+
+/// <summary>
+/// Where passages are in their document: their pages or parts, and the words around them.
+/// </summary>
+/// <remarks>
+/// Kept in parts rather than as one text, so that each page can be shown as a link of its own,
+/// while the words around the numbers still come from one translation, e.g., "Pages " and nothing
+/// for "Pages 1, 11". Written out as a whole, see ToString, it reads the same as the parts.
+/// </remarks>
+/// <param name="Prefix">What stands before the numbers, e.g., "Pages ".</param>
+/// <param name="Ranges">The pages or parts, in the order of the document, each once.</param>
+/// <param name="Suffix">What stands after the numbers, often nothing.</param>
+/// <param name="ArePages">Whether the numbers are pages, at which a document can be opened, or the parts of a document without pages.</param>
+public sealed record PassageLocation(string Prefix, IReadOnlyList<LocationRange> Ranges, string Suffix, bool ArePages)
+{
+    /// <summary>
+    /// What stands between two ranges.
+    /// </summary>
+    public const string RANGE_SEPARATOR = ", ";
+
+    /// <summary>
+    /// The location as one text, e.g., "Pages 1, 11" or "Part 3".
+    /// </summary>
+    public override string ToString() => $"{this.Prefix}{string.Join(RANGE_SEPARATOR, this.Ranges)}{this.Suffix}";
+}