feat: implement default prompt for analysis

src/StreamShorts.Library/Analysis/TranscriptAnalysis.cs

@@ -1,6 +1,12 @@
 namespace StreamShorts.Library.Analysis;
 
-public class TranscriptAnalysis(IEnumerable<ShortClip> shortClips)
+/// <summary>
+/// Represents the analysis of a transcript, containing short clips derived from the transcript.
+/// </summary>
+public sealed class TranscriptAnalysis(IEnumerable<ShortClip> shortClips)
 {
+  /// <summary>
+  /// Gets the short clips derived from the transcript.
+  /// </summary>
   public IEnumerable<ShortClip> ShortClips { get; init; } = shortClips;
 }