Replaced .NET skeletal app with a Visual Studio solution structure.

CivicVisualizer.sln

@@ -0,0 +1,14 @@
+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31903.59
+MinimumVisualStudioVersion = 10.0.40219.1
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal

Program.cs

@@ -1,9 +0,0 @@
-using System;
-
-class Program
-{
-    static void Main(string[] args)
-    {
-        Console.WriteLine("Hello from .NET skeletal app. Edit Program.cs to get started!");
-    }
-}

SampleApp.csproj

@@ -1,12 +0,0 @@
-<Project Sdk="Microsoft.NET.Sdk">
-  <PropertyGroup>
-    <OutputType>Exe</OutputType>
-    <TargetFramework>net8.0</TargetFramework>
-    <ImplicitUsings>enable</ImplicitUsings>
-    <Nullable>enable</Nullable>
-  </PropertyGroup>
-  <ItemGroup>
-    <None Include="flake.nix" />
-    <None Include=".envrc" />
-  </ItemGroup>
-</Project>