Add project files.

0.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.32126.315
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "0", "0\0.csproj", "{44D2FF5E-EF84-4E1B-AFFD-0FD652325A32}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{44D2FF5E-EF84-4E1B-AFFD-0FD652325A32}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{44D2FF5E-EF84-4E1B-AFFD-0FD652325A32}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{44D2FF5E-EF84-4E1B-AFFD-0FD652325A32}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{44D2FF5E-EF84-4E1B-AFFD-0FD652325A32}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {4C41F8A8-934D-4493-9767-0EFED0C61C94}
+	EndGlobalSection
+EndGlobal

0/0.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+    <RootNamespace>_0</RootNamespace>
+  </PropertyGroup>
+
+</Project>

0/Program.cs

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+using System;
+
+namespace _0
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("Hello World!");
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+        }
+    }
+}