Add project files.

BidderGUI.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.4.33213.308
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "BidderGUI", "BidderGUI\BidderGUI.csproj", "{B795BA92-123D-4ABB-A3B9-6A35F7760C2E}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{B795BA92-123D-4ABB-A3B9-6A35F7760C2E}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{B795BA92-123D-4ABB-A3B9-6A35F7760C2E}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{B795BA92-123D-4ABB-A3B9-6A35F7760C2E}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{B795BA92-123D-4ABB-A3B9-6A35F7760C2E}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {E68CED6D-47DF-42D3-BFA5-3906E94F79DB}
+	EndGlobalSection
+EndGlobal

BidderGUI/BidderGUI.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>WinExe</OutputType>
+    <TargetFramework>net6.0-windows</TargetFramework>
+    <Nullable>enable</Nullable>
+    <UseWindowsForms>true</UseWindowsForms>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <ApplicationIcon>NJW Icon 512.ico</ApplicationIcon>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <Content Include="NJW Icon 512.ico" />
+  </ItemGroup>
+
+</Project>