chore(*): Move all C# solutions into a C# folder to make it clearer which languages are used

AdventOfCode C#/DayCreator/Program.cs

@@ -0,0 +1,49 @@
+using System.Collections.Generic;
+using System;
+using System.IO;
+using System.Text;
+
+Console.Write("Year: ");
+var year = Console.ReadLine();
+
+Console.Write("Day: ");
+var day = Console.ReadLine().PadLeft(2, '0'); ;
+
+var currentLocation = System.Reflection.Assembly.GetExecutingAssembly().Location;
+int ix = currentLocation.IndexOf("DayCreator");
+var newPathBase = currentLocation.Substring(0, ix - 1);
+var newDayCreatorBase = currentLocation.Substring(0, ix + "DayCreator".Length);
+
+string yearPath = Path.GetFullPath(Path.Combine(newPathBase, "AOC.Tests", $"Y{year}"));
+string dataPath = Path.GetFullPath(Path.Combine(yearPath, "Data", $"Day{day}.dat"));
+string tasksPath = Path.GetFullPath(Path.Combine(yearPath, "Tasks", $"Day{day}.txt"));
+
+// Check and create missing directories
+if (!Directory.Exists(yearPath))
+{
+    Directory.CreateDirectory(yearPath);
+}
+
+if (!Directory.Exists(Path.Combine(yearPath, "Data")))
+{
+    Directory.CreateDirectory(Path.Combine(yearPath, "Data"));
+}
+
+if (!Directory.Exists(Path.Combine(yearPath, "Tasks")))
+{
+    Directory.CreateDirectory(Path.Combine(yearPath, "Tasks"));
+}
+
+// Create data file
+using (FileStream fs = File.Create(dataPath));
+
+// Create task file
+using (FileStream fs = File.Create(tasksPath));
+
+// Create code file
+var dayXPath = Path.GetFullPath(Path.Combine(newDayCreatorBase, "DayX.cs"));
+string text = File.ReadAllText(dayXPath);
+text = text.Replace("YX", $"Y{year}");
+text = text.Replace("DayX", $"Day{day}");
+var writePath = Path.GetFullPath(Path.Combine(yearPath, $"Day{day}.cs"));
+File.WriteAllText(writePath, text);