Added Summaries to Chapter and Connector

Made some methods static

Tranga/Chapter.cs

@@ -2,6 +2,10 @@
 
 namespace Tranga;
 
+/// <summary>
+/// Has to be Part of a publication
+/// Includes the Chapter-Name, -VolumeNumber, -ChapterNumber, the location of the chapter on the internet and the saveName of the local file.
+/// </summary>
 public struct Chapter
 {
     public string? name { get; }