Add project files.

LPaper.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+</Project>

LPaper.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.4.33205.214
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "LWallPaper", "..\LWallPaper\LWallPaper.csproj", "{19060C60-034D-457F-B9CE-81EAFB9BA57D}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Debug|x64 = Debug|x64
+		Release|Any CPU = Release|Any CPU
+		Release|x64 = Release|x64
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{19060C60-034D-457F-B9CE-81EAFB9BA57D}.Debug|Any CPU.ActiveCfg = Debug|x64
+		{19060C60-034D-457F-B9CE-81EAFB9BA57D}.Debug|Any CPU.Build.0 = Debug|x64
+		{19060C60-034D-457F-B9CE-81EAFB9BA57D}.Debug|x64.ActiveCfg = Debug|x64
+		{19060C60-034D-457F-B9CE-81EAFB9BA57D}.Debug|x64.Build.0 = Debug|x64
+		{19060C60-034D-457F-B9CE-81EAFB9BA57D}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{19060C60-034D-457F-B9CE-81EAFB9BA57D}.Release|Any CPU.Build.0 = Release|Any CPU
+		{19060C60-034D-457F-B9CE-81EAFB9BA57D}.Release|x64.ActiveCfg = Release|x64
+		{19060C60-034D-457F-B9CE-81EAFB9BA57D}.Release|x64.Build.0 = Release|x64
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {1FB8E16E-BD2F-4225-9EAD-5D330A19AA8A}
+	EndGlobalSection
+EndGlobal

Program.cs

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