Added PowerPoint templates to the Slide Assistant (#1055)

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

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

@@ -0,0 +1,14 @@
+namespace AIStudio.Tools.PowerPoint;
+
+/// <summary>
+/// A presentation as the model describes it, slide by slide.
+/// </summary>
+/// <remarks>
+/// The model writes JSON, which is read leniently into this shape: whatever the model may write in
+/// several ways, such as a number in a table cell, is accepted, and every missing value becomes
+/// empty. Whether the slides fit the template is a separate question, which
+/// SlideDeckSpecValidator answers.
+/// </remarks>
+/// <param name="Title">The title of the presentation.</param>
+/// <param name="Slides">The slides, in order.</param>
+internal sealed partial record SlideDeckSpec(string Title, IReadOnlyList<SlideSpec> Slides);