feature: cross-platform UI

Directory.Build.props

@@ -0,0 +1,6 @@
+<Project>
+  <PropertyGroup>
+    <Nullable>enable</Nullable>
+    <AvaloniaVersion>11.0.6</AvaloniaVersion>
+  </PropertyGroup>
+</Project>

OpenCiv1.Resources/OpenCiv1.Resources.csproj

@@ -0,0 +1,37 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+	<PropertyGroup>
+		<TargetFramework>net8.0</TargetFramework>
+		<ImplicitUsings>enable</ImplicitUsings>
+		<Nullable>enable</Nullable>
+		<WarningsAsErrors>nullable</WarningsAsErrors>
+		<Title>OpenCiv1 - Open source rewrite of Civilization 1 Game designed by Sid Meier and Bruce Shelley in year 1991</Title>
+		<Version>1.475.6.7</Version>
+		<Copyright>Copyright (c) 2023- by Rajko Horvat, Parts of the code Copyright (c) 1991 Microprose Software, Inc. and Take-Two Interactive Software, Inc.</Copyright>
+		<PackageProjectUrl>https://github.com/rajko-horvat/OpenCiv1</PackageProjectUrl>
+		<PackageReadmeFile>..\README.md</PackageReadmeFile>
+		<RepositoryUrl>https://github.com/rajko-horvat/OpenCiv1</RepositoryUrl>
+		<RepositoryType>git</RepositoryType>
+		<PackageTags>game;retro;remake;civilization;retrogaming;4x-strategy-game;4x;retro-game;civilization-games;sid-meier-civilization;remake-games</PackageTags>
+		<NeutralLanguage>en</NeutralLanguage>
+		<PackageLicenseFile>..\LICENSE</PackageLicenseFile>
+		<WarningsAsErrors>nullable</WarningsAsErrors>
+		<Authors>Rajko Horvat</Authors>
+	</PropertyGroup>
+
+	<ItemGroup>
+	<Compile Update="Properties\Resources.Designer.cs">
+		<DependentUpon>Resources.resx</DependentUpon>
+		<DesignTime>True</DesignTime>
+		<AutoGen>True</AutoGen>
+	</Compile>
+	</ItemGroup>
+
+	<ItemGroup>
+	<EmbeddedResource Update="Properties\Resources.resx">
+		<LastGenOutput>Resources.Designer.cs</LastGenOutput>
+		<Generator>ResXFileCodeGenerator</Generator>
+	</EmbeddedResource>
+	</ItemGroup>
+
+</Project>