Add project files.

Seraphina.Tests/Seraphina.Tests.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>netcoreapp3.1</TargetFramework>
+
+    <IsPackable>false</IsPackable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.NET.Test.Sdk" Version="16.2.0" />
+    <PackageReference Include="xunit" Version="2.4.0" />
+    <PackageReference Include="xunit.runner.visualstudio" Version="2.4.0" />
+    <PackageReference Include="coverlet.collector" Version="1.0.1" />
+  </ItemGroup>
+
+</Project>

Seraphina.Tests/UnitTest1.cs

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+using System;
+using Xunit;
+
+namespace Seraphina.Tests
+{
+    public class UnitTest1
+    {
+        [Fact]
+        public void Test1()
+        {
+
+        }
+    }
+}

Seraphina.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 16
+VisualStudioVersion = 16.0.29806.167
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Seraphina", "Seraphina\Seraphina.csproj", "{B28A5183-DCBC-4EC7-96C5-71CCC4D8BF81}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Seraphina.Tests", "Seraphina.Tests\Seraphina.Tests.csproj", "{BAB93135-1545-41D0-B829-CB35CA575A87}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{B28A5183-DCBC-4EC7-96C5-71CCC4D8BF81}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B28A5183-DCBC-4EC7-96C5-71CCC4D8BF81}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B28A5183-DCBC-4EC7-96C5-71CCC4D8BF81}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B28A5183-DCBC-4EC7-96C5-71CCC4D8BF81}.Release|Any CPU.Build.0 = Release|Any CPU
+		{BAB93135-1545-41D0-B829-CB35CA575A87}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{BAB93135-1545-41D0-B829-CB35CA575A87}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{BAB93135-1545-41D0-B829-CB35CA575A87}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{BAB93135-1545-41D0-B829-CB35CA575A87}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {4CE5E21A-1ED9-4159-9B30-B69D00741482}
+	EndGlobalSection
+EndGlobal

Seraphina/Program.cs

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

Seraphina/Seraphina.csproj

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