Add approximate run time using StopWatch

Program.cs

@@ -1,4 +1,5 @@
 
+using System.Diagnostics;
 using System.Reflection;
 using AdventOfCode.Days;
 using Spectre.Console;
@@ -13,23 +14,35 @@ var select = new SelectionPrompt<Day>()
 
 var selectedDay = AnsiConsole.Prompt(select);
 
+var stopWatch = new Stopwatch();
+
 AnsiConsole.MarkupLine($"[cyan]Running [yellow]{selectedDay}[/]...[/]\n");
 
 AnsiConsole.MarkupLine("[cyan]Part [yellow]1[/] result:[/]");
 
 try
 {
+    stopWatch.Start();
     selectedDay.RunPart1();
+    stopWatch.Stop();
+
+    AnsiConsole.MarkupLine($"[red]Approximate run time: [yellow]{stopWatch.ElapsedTicks / (double)Stopwatch.Frequency * 1000:F3} ms[/][/]");
 }
 catch (Exception e)
 {
     AnsiConsole.WriteException(e);
 }
 
+stopWatch.Reset();
+
 AnsiConsole.MarkupLine("\n[cyan]Part [yellow]2[/] result:[/]");
 try
 {
+    stopWatch.Start();
     selectedDay.RunPart2();
+    stopWatch.Stop();
+
+    AnsiConsole.MarkupLine($"[red]Approximate run time: [yellow]{stopWatch.ElapsedTicks / (double)Stopwatch.Frequency * 1000:F3} ms[/][/]");
 }
 catch (Exception e)
 {