feat: begin working on console app

src/AltGen.Console/AltGen.Console.csproj

@@ -0,0 +1,16 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.Extensions.Hosting" Version="9.0.1" />
+    <PackageReference Include="Spectre.Console" Version="0.49.1" />
+    <PackageReference Include="Spectre.Console.Cli" Version="0.49.1" />
+  </ItemGroup>
+
+</Project>

src/AltGen.Console/Common/TypeRegistrar.cs

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+namespace AltGen.Console.Common;
+
+sealed class TypeRegistrar(IHostBuilder builder) : ITypeRegistrar
+{
+  readonly IHostBuilder _builder = builder;
+
+  public ITypeResolver Build()
+  {
+    return new TypeResolver(_builder.Build());
+  }
+
+  public void Register(Type service, Type implementation)
+  {
+    _builder.ConfigureServices((_, services) => services.AddSingleton(service, implementation));
+  }
+
+  public void RegisterInstance(Type service, object implementation)
+  {
+    _builder.ConfigureServices((_, services) => services.AddSingleton(service, implementation));
+  }
+
+  public void RegisterLazy(Type service, Func<object> func)
+  {
+    ArgumentNullException.ThrowIfNull(func);
+
+    _builder.ConfigureServices((_, services) => services.AddSingleton(service, _ => func()));
+  }
+}

src/AltGen.Console/Common/TypeResolver.cs

@@ -0,0 +1,24 @@
+namespace AltGen.Console.Common;
+
+sealed class TypeResolver(IHost host) : ITypeResolver, IDisposable
+{
+  readonly IHost _host = host ?? throw new ArgumentNullException(nameof(host));
+
+  public object? Resolve(Type? type)
+  {
+    if (type is null)
+    {
+      return null;
+    }
+
+    return _host.Services.GetService(type);
+  }
+
+  public void Dispose()
+  {
+    if (_host is IDisposable disposable)
+    {
+      disposable.Dispose();
+    }
+  }
+}

src/AltGen.Console/Program.cs

@@ -0,0 +1,14 @@
+// TODO: We want to be able
+// to provide a path to an image
+// read the image
+// and then post the image to our API
+// get the response and display the alt text
+
+using Microsoft.Extensions.Hosting;
+
+await Host.CreateDefaultBuilder(args)
+  .ConfigureServices(static (_, services) => { })
+  .Build() // TODO: Need special extension for integrating host with Spectre.Console
+  .RunAsync();
+
+Console.WriteLine("Hello, World!");

src/AltGen.Console/Usings.cs

@@ -0,0 +1,4 @@
+global using Microsoft.Extensions.DependencyInjection;
+global using Microsoft.Extensions.Hosting;
+
+global using Spectre.Console.Cli;