Added PowerPoint templates to the Slide Assistant (#1055)

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

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

@@ -0,0 +1,9 @@
+namespace AIStudio.Tools.PowerPoint;
+
+/// <summary>
+/// A picture of a picture library, which the LLM may choose by its name.
+/// </summary>
+/// <param name="FilePath">The full path of the file.</param>
+/// <param name="Name">The path below the library folder, with forward slashes, e.g., "icons/rocket.png"; this is what the LLM reads.</param>
+/// <param name="IsIcon">Whether the picture is an icon, because its name or the name of one of its folders starts with "icon".</param>
+internal sealed record LibraryPicture(string FilePath, string Name, bool IsIcon);