cleanupAdd project files.

McsrGraphImageDownloader.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net9.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <PublishAot>true</PublishAot>
+    <InvariantGlobalization>true</InvariantGlobalization>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Svg" Version="3.4.7" />
+  </ItemGroup>
+</Project>

McsrGraphImageDownloader.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.14.37216.2 d17.14
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "McsrGraphImageDownloader", "McsrGraphImageDownloader.csproj", "{A8D4F4FE-B5EA-48CA-98D4-337C666053F4}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{A8D4F4FE-B5EA-48CA-98D4-337C666053F4}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A8D4F4FE-B5EA-48CA-98D4-337C666053F4}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A8D4F4FE-B5EA-48CA-98D4-337C666053F4}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A8D4F4FE-B5EA-48CA-98D4-337C666053F4}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {A55629BA-B519-4788-B13B-55C88DD1B069}
+	EndGlobalSection
+EndGlobal

Program.cs

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+using Svg;
+using System.Runtime.InteropServices;
+using System.Text;
+using System.Text.Json;
+
+namespace McsrGraphImageDownloader;
+
+internal class Program {
+    [DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
+    public static extern int SystemParametersInfo(int uAction, int uParam, string lpvParam, int fuWinIni);
+    public const int SPI_SETDESKWALLPAPER = 20;
+    public const int SPIF_UPDATEINIFILE = 1;
+    public const int SPIF_SENDCHANGE = 2;
+    private const string outputFilename = "mcsrChart.png";
+
+    private static async Task Main(string[] args) {
+        using var hc = new HttpClient();
+        while (true) {
+            var svgJson = await hc.GetStringAsync("https://mcsr.ghxx.dev/api/chart");
+            var svgText = JsonDocument.Parse(svgJson).RootElement.GetProperty("data").GetString();
+            var svg = SvgDocument.Open<SvgDocument>(new MemoryStream(Encoding.UTF8.GetBytes(svgText!)));
+            using (var bitmap = svg.Draw(1920, 1080)) {
+                bitmap.Save(outputFilename);
+            }
+            SystemParametersInfo(SPI_SETDESKWALLPAPER, 0, Path.GetFullPath(outputFilename), SPIF_UPDATEINIFILE | SPIF_SENDCHANGE);
+
+            await Task.Delay(TimeSpan.FromMinutes(15));
+        }
+    }
+}