Add day selector

.gitignore

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+bin/
+obj/
+/packages/
+riderModule.iml
+/_ReSharper.Caches/
+.idea/.idea.AdventOfCode/.idea

AdventOfCode.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+    <PropertyGroup>
+        <OutputType>Exe</OutputType>
+        <TargetFramework>net7.0</TargetFramework>
+        <ImplicitUsings>enable</ImplicitUsings>
+        <Nullable>enable</Nullable>
+    </PropertyGroup>
+
+    <ItemGroup>
+      <PackageReference Include="Spectre.Console" Version="0.45.0" />
+    </ItemGroup>
+
+</Project>

AdventOfCode.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AdventOfCode", "AdventOfCode.csproj", "{566CA1D9-1EDC-491C-8196-CA163F9D6FE1}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{566CA1D9-1EDC-491C-8196-CA163F9D6FE1}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{566CA1D9-1EDC-491C-8196-CA163F9D6FE1}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{566CA1D9-1EDC-491C-8196-CA163F9D6FE1}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{566CA1D9-1EDC-491C-8196-CA163F9D6FE1}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+EndGlobal

Days/Day.cs

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+namespace AdventOfCode.Days;
+
+public abstract class Day
+{
+    public abstract int Number { get; }
+    public abstract string Name { get; }
+    
+    public abstract void Run();
+
+    public override string ToString()
+    {
+        return $"Day {Number}: {Name}";
+    }
+}

Days/Day1.cs

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+using Spectre.Console;
+
+namespace AdventOfCode.Days;
+
+public class Day1 : Day
+{
+    public override int Number => 1;
+    public override string Name => "First day";
+
+    public override void Run()
+    {
+        AnsiConsole.WriteLine("Day 1 result");
+    }
+}

Days/Day2.cs

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+using Spectre.Console;
+
+namespace AdventOfCode.Days;
+
+public class Day2 : Day
+{
+    public override int Number { get; } = 2;
+    public override string Name { get; } = "Second day";
+    
+    public override void Run()
+    {
+        AnsiConsole.WriteLine("Day 2 result");
+    }
+}

Program.cs

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+
+using System.Reflection;
+using AdventOfCode.Days;
+using Spectre.Console;
+
+var days = Assembly.GetAssembly(typeof(Day))!.GetTypes()
+    .Where(t => t.IsAssignableTo(typeof(Day)) && t.GetConstructor(Type.EmptyTypes) != null && !t.IsAbstract)
+    .Select(t => (Day)Activator.CreateInstance(t)!);
+
+var select = new SelectionPrompt<Day>()
+    .Title("[cyan]Select a [yellow]day[/] to run:[/]")
+    .AddChoices(days);
+
+var selectedDay = AnsiConsole.Prompt(select);
+
+AnsiConsole.MarkupLine($"[cyan]Running [yellow]{selectedDay}[/]...[/]\n");
+
+selectedDay.Run();