Added some summaries

FFMpegCore/FFMPEG/Pipes/IPipeSource.cs

@@ -6,6 +6,9 @@
 
 namespace FFMpegCore.FFMPEG.Pipes
 {
+    /// <summary>
+    /// Interface for ffmpeg pipe source data IO
+    /// </summary>
     public interface IPipeSource
     {
         string GetFormat();

FFMpegCore/FFMPEG/Pipes/IVideoFrame.cs

@@ -5,6 +5,9 @@
 
 namespace FFMpegCore.FFMPEG.Pipes
 {
+    /// <summary>
+    /// Interface for Video frame
+    /// </summary>
     public interface IVideoFrame
     {
         int Width { get; }

FFMpegCore/FFMPEG/Pipes/RawVideoPipeSource.cs

@@ -6,6 +6,9 @@
 
 namespace FFMpegCore.FFMPEG.Pipes
 {
+    /// <summary>
+    /// Implementation of <see cref="IPipeSource"/> for a raw video stream that is gathered from <see cref="IEnumerator{IVideoFrame}"/> 
+    /// </summary>
     public class RawVideoPipeSource : IPipeSource
     {
         public string StreamFormat { get; set; }