プロジェクト ファイルを追加します。

FY2526-SW-PoC-APIRelay.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.14.36603.0 d17.14
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "FY2526-SW-PoC-APIRelay", "FY2526-SW-PoC-APIRelay\FY2526-SW-PoC-APIRelay.csproj", "{17F82B0E-3680-419D-A68C-C1CB716528C6}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{17F82B0E-3680-419D-A68C-C1CB716528C6}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{17F82B0E-3680-419D-A68C-C1CB716528C6}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{17F82B0E-3680-419D-A68C-C1CB716528C6}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{17F82B0E-3680-419D-A68C-C1CB716528C6}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {A07BF1CC-3E58-4E19-A10B-90D528881F6A}
+	EndGlobalSection
+EndGlobal

FY2526-SW-PoC-APIRelay/FY2526-SW-PoC-APIRelay.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <RootNamespace>FY2526_SW_PoC_APIRelay</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

FY2526-SW-PoC-APIRelay/Program.cs

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+// See https://aka.ms/new-console-template for more information
+Console.WriteLine("Hello, World!");