Added PowerPoint templates to the Slide Assistant (#1055)

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

app/MindWork AI Studio/Tools/PowerPoint/SlideTableSpec.cs

@@ -0,0 +1,8 @@
+namespace AIStudio.Tools.PowerPoint;
+
+/// <summary>
+/// The content of a table slot.
+/// </summary>
+/// <param name="Headers">The column headers, which also give the number of columns.</param>
+/// <param name="Rows">The rows below the header, each with one text per column.</param>
+internal sealed record SlideTableSpec(IReadOnlyList<string> Headers, IReadOnlyList<IReadOnlyList<string>> Rows);