Add project files.

AOC2023/AOC2023.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\AOC Runner\AOC Runner.csproj" />
+  </ItemGroup>
+
+</Project>

AOC2023/TestProblem.cs

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+using AOC.Runner;
+
+namespace AOC2023;
+[ProblemInfo("2023", 0, "Test")]
+public class TestProblem : IProblemBase
+{
+	public void LoadInput()
+	{
+		Thread.Sleep(1000);
+	}
+
+	public void CalculatePart1()
+	{
+		Thread.Sleep(1000);
+	}
+
+	public void CalculatePart2()
+	{
+		Thread.Sleep(1000);
+	}
+
+
+	public void PrintPart1()
+	{
+		Console.WriteLine("Result");
+	}
+
+	public void PrintPart2()
+	{
+		Console.WriteLine("Result 2");
+	}
+}