Added audio recording (#615)

app/MindWork AI Studio/Tools/MIME/VideoBuilder.cs

@@ -0,0 +1,46 @@
+namespace AIStudio.Tools.MIME;
+
+public class VideoBuilder : ISubtype
+{
+    private const BaseType BASE_TYPE = BaseType.VIDEO;
+
+    private VideoBuilder()
+    {
+    }
+
+    public static VideoBuilder Create() => new();
+    
+    private VideoSubtype subtype;
+
+    public VideoBuilder UseSubtype(string subType)
+    {
+        this.subtype = subType.ToLowerInvariant() switch
+        {
+            "mp4" => VideoSubtype.MP4,
+            "webm" => VideoSubtype.WEBM,
+            "avi" => VideoSubtype.AVI,
+            "mov" => VideoSubtype.MOV,
+            "mkv" => VideoSubtype.MKV,
+            
+            _ => throw new ArgumentException("Unsupported MIME video subtype.", nameof(subType))
+        };
+
+        return this;
+    }
+
+    public VideoBuilder UseSubtype(VideoSubtype subType)
+    {
+        this.subtype = subType;
+        return this;
+    }
+    
+    #region Implementation of IMIMESubtype
+
+    public MIMEType Build() => new()
+    {
+        Type = this,
+        TextRepresentation = $"{BASE_TYPE}/{this.subtype}".ToLowerInvariant()
+    };
+
+    #endregion
+}