Add minimal MSBuild-based C# Hello World sample with CI build workflow

.github/workflows/build.yml

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+name: Build with MSBuild
+
+on:
+  push:
+    branches:
+      - main
+  pull_request:
+
+jobs:
+  build:
+    runs-on: windows-latest
+    permissions:
+      contents: read
+
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Setup .NET
+        uses: actions/setup-dotnet@v4
+        with:
+          dotnet-version: '8.0.x'
+
+      - name: Setup MSBuild
+        uses: microsoft/setup-msbuild@v2
+
+      - name: Restore and build solution with MSBuild
+        run: msbuild HelloWorld.sln /t:Restore,Build /p:Configuration=Release

.gitignore

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+**/bin/
+**/obj/

HelloWorld.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31903.59
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "src", "src", "{827E0CD3-B72D-47B6-A68D-7590B98EB39B}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "HelloWorld", "src\HelloWorld\HelloWorld.csproj", "{44691A85-F760-4C30-99B5-BC0BE9799919}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Debug|x64 = Debug|x64
+		Debug|x86 = Debug|x86
+		Release|Any CPU = Release|Any CPU
+		Release|x64 = Release|x64
+		Release|x86 = Release|x86
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{44691A85-F760-4C30-99B5-BC0BE9799919}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{44691A85-F760-4C30-99B5-BC0BE9799919}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{44691A85-F760-4C30-99B5-BC0BE9799919}.Debug|x64.ActiveCfg = Debug|Any CPU
+		{44691A85-F760-4C30-99B5-BC0BE9799919}.Debug|x64.Build.0 = Debug|Any CPU
+		{44691A85-F760-4C30-99B5-BC0BE9799919}.Debug|x86.ActiveCfg = Debug|Any CPU
+		{44691A85-F760-4C30-99B5-BC0BE9799919}.Debug|x86.Build.0 = Debug|Any CPU
+		{44691A85-F760-4C30-99B5-BC0BE9799919}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{44691A85-F760-4C30-99B5-BC0BE9799919}.Release|Any CPU.Build.0 = Release|Any CPU
+		{44691A85-F760-4C30-99B5-BC0BE9799919}.Release|x64.ActiveCfg = Release|Any CPU
+		{44691A85-F760-4C30-99B5-BC0BE9799919}.Release|x64.Build.0 = Release|Any CPU
+		{44691A85-F760-4C30-99B5-BC0BE9799919}.Release|x86.ActiveCfg = Release|Any CPU
+		{44691A85-F760-4C30-99B5-BC0BE9799919}.Release|x86.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(NestedProjects) = preSolution
+		{44691A85-F760-4C30-99B5-BC0BE9799919} = {827E0CD3-B72D-47B6-A68D-7590B98EB39B}
+	EndGlobalSection
+EndGlobal

README.md

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-# test-msbuild
+# test-msbuild
+
+Sample C# "Hello, World!" console app built with MSBuild.
+
+## Build with MSBuild
+
+```bash
+dotnet msbuild HelloWorld.sln /t:Restore,Build /p:Configuration=Release
+```
+
+## Run locally
+
+```bash
+dotnet run --project src/HelloWorld/HelloWorld.csproj
+```

src/HelloWorld/HelloWorld.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

src/HelloWorld/Program.cs

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+Console.WriteLine("Hello, World!");