Added transcription of audio and video files to local data sources (#1081)

Co-authored-by: Paul Koudelka <106623909+PaulKoudelka@users.noreply.github.com>

app/MindWork AI Studio/Tools/Media/MediaTranscriptSlot.cs

@@ -0,0 +1,8 @@
+namespace AIStudio.Tools.Media;
+
+/// <summary>
+/// The place of the persistent transcript of one audio or video file.
+/// </summary>
+/// <param name="Path">The absolute path of the Markdown transcript.</param>
+/// <param name="Key">What identifies the transcript at its location, e.g. the hash of the media content.</param>
+internal sealed record MediaTranscriptSlot(string Path, string Key);