chore(*): Add day creation tool

AdventOfCode/DayCreator/Program.cs

@@ -0,0 +1,30 @@
+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);
+
+string yearPath = Path.GetFullPath(Path.Combine(newPathBase, $@"AOC.Tests\Y{year}\"));
+string dataPath = Path.GetFullPath(Path.Combine(yearPath, $@"Data\"));
+string tasksPath = Path.GetFullPath(Path.Combine(yearPath, $@"Tasks\"));
+
+// Create data file
+using (FileStream fs = File.Create($"{dataPath}Day{day}.dat"));
+
+// Create task file
+using (FileStream fs = File.Create($"{tasksPath}Day{day}.txt"));
+
+// Create code file
+string text = File.ReadAllText("DayX.cs");
+text = text.Replace("YX", $"Y{year}");
+text = text.Replace("DayX", $"Day{day}");
+File.WriteAllText($"{yearPath}Day{day}.cs", text);