Add project files.

Adv2015.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.28307.329
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "D01.1", "D01.1\D01.1.csproj", "{4F8C0427-49D7-41ED-A7FC-490C79560CBA}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{4F8C0427-49D7-41ED-A7FC-490C79560CBA}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{4F8C0427-49D7-41ED-A7FC-490C79560CBA}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{4F8C0427-49D7-41ED-A7FC-490C79560CBA}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{4F8C0427-49D7-41ED-A7FC-490C79560CBA}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {0039E0A3-65F6-4B73-90A4-E81B3E839527}
+	EndGlobalSection
+EndGlobal

D01.1/D01.1.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp2.1</TargetFramework>
+    <RootNamespace>D01._1</RootNamespace>
+  </PropertyGroup>
+
+</Project>

D01.1/Program.cs

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+using System;
+
+namespace D01._1
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("Hello World!");
+        }
+    }
+}