Add DocumentService.Client project to solution

Introduced a new `DocumentService.Client` project targeting `net462`, `net480`, and `net8.0`. The project includes metadata for NuGet packaging, such as `PackageId`, `Authors`, and `Company`, and references `Microsoft.Extensions.DependencyInjection` and `Microsoft.Extensions.Logging`.

Updated `DocumentService.sln` to include the new project, its build configurations, and solution folder associations.

Added `icon.png` as the NuGet package icon and included it in the project file.

DocumentService.Client/DocumentService.Client.csproj

@@ -0,0 +1,35 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+	<PropertyGroup>
+		<TargetFrameworks>net462;net480;net8.0</TargetFrameworks>
+		<DocumentationFile>bin\$(Configuration)\$(TargetFramework)\$(MSBuildProjectName).xml</DocumentationFile>
+		<PackageId>DocumentService.Client</PackageId>
+		<Authors>Digital Data GmbH</Authors>
+		<Company>Digital Data GmbH</Company>
+		<Product>DocumentService.Client</Product>
+		<Copyright>Copyright 2026</Copyright>
+		<PackageIcon>icon.png</PackageIcon>
+		<RepositoryUrl>http://git.dd:3000/AppStd/Rec.git</RepositoryUrl>
+		<PackageTags>digital data document service api client</PackageTags>
+		<Version>1.0.0</Version>
+		<AssemblyVersion>1.0.0.0</AssemblyVersion>
+		<FileVersion>1.0.0.0</FileVersion>
+		<Description></Description>
+		<ImplicitUsings>enable</ImplicitUsings>
+		<Nullable>enable</Nullable>
+		<LangVersion>latest</LangVersion>
+	</PropertyGroup>
+
+	<ItemGroup>
+		<PackageReference Include="Microsoft.Extensions.DependencyInjection" Version="10.0.10" />
+		<PackageReference Include="Microsoft.Extensions.Logging" Version="10.0.10" />
+	</ItemGroup>
+	
+	<ItemGroup>
+		<None Include="..\assets\icon.png">
+			<Pack>True</Pack>
+			<PackagePath>\</PackagePath>
+		</None>
+	</ItemGroup>
+
+</Project>

DocumentService.sln

@@ -38,6 +38,8 @@ Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "src", "src", "{2B18D2F8-40C
 EndProject
 Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "tests", "tests", "{D64772B8-6213-4031-8064-2567F1E724F6}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "DocumentService.Client", "DocumentService.Client\DocumentService.Client.csproj", "{626E2002-8EC1-4FF9-A9A6-51D5809E26FC}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -64,6 +66,10 @@ Global
 		{32D2E997-3DA7-4061-8A50-DBB34BBC3E5A}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{32D2E997-3DA7-4061-8A50-DBB34BBC3E5A}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{32D2E997-3DA7-4061-8A50-DBB34BBC3E5A}.Release|Any CPU.Build.0 = Release|Any CPU
+		{626E2002-8EC1-4FF9-A9A6-51D5809E26FC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{626E2002-8EC1-4FF9-A9A6-51D5809E26FC}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{626E2002-8EC1-4FF9-A9A6-51D5809E26FC}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{626E2002-8EC1-4FF9-A9A6-51D5809E26FC}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE
@@ -78,6 +84,7 @@ Global
 		{0B80DDC4-A13C-4C5F-8520-AA2F3650E884} = {2B18D2F8-40C1-4CA0-99AB-7F98F254FEB8}
 		{62E8F4B3-EA49-41D2-8843-0636EB4421BB} = {2B18D2F8-40C1-4CA0-99AB-7F98F254FEB8}
 		{9BACC18A-5C6D-4678-A43C-A19907AE9CF3} = {2B18D2F8-40C1-4CA0-99AB-7F98F254FEB8}
+		{626E2002-8EC1-4FF9-A9A6-51D5809E26FC} = {62E8F4B3-EA49-41D2-8843-0636EB4421BB}
 	EndGlobalSection
 	GlobalSection(ExtensibilityGlobals) = postSolution
 		SolutionGuid = {832CA90A-06D6-4312-9B35-16CC665EB37C}