Added first extensions to work with System.Drawing-bitmaps

HPPH.System.Drawing/HPPH.System.Drawing.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+    <AllowUnsafeBlocks>true</AllowUnsafeBlocks>
+  </PropertyGroup>
+  
+  <ItemGroup>
+    <PackageReference Include="System.Drawing.Common" Version="8.0.6" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <ProjectReference Include="..\HPPH\HPPH.csproj" />
+  </ItemGroup>
+
+</Project>

HPPH.System.Drawing/ImageExtension.cs

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+using System.Drawing;
+using System.Drawing.Imaging;
+using System.Runtime.Versioning;
+
+namespace HPPH.System.Drawing;
+
+public static class ImageExtension
+{
+    public static Bitmap ToBitmap(this IImage image)
+    {
+        throw new NotImplementedException();
+    }
+
+    [SupportedOSPlatform("windows")]
+    public static unsafe IImage ToImage(this Bitmap bitmap)
+    {
+        BitmapData data = bitmap.LockBits(new Rectangle(0, 0, bitmap.Width, bitmap.Height), ImageLockMode.ReadOnly, bitmap.PixelFormat);
+        ReadOnlySpan<byte> buffer = new(data.Scan0.ToPointer(), data.Stride * data.Height);
+
+        IImage image;
+
+        if (data.PixelFormat.HasFlag(PixelFormat.Format24bppRgb))
+            image = Image<ColorRGB>.Create(buffer, data.Width, data.Height, data.Stride);
+        else if (data.PixelFormat.HasFlag(PixelFormat.Format32bppArgb))
+            image = Image<ColorARGB>.Create(buffer, data.Width, data.Height, data.Stride);
+        else throw new NotSupportedException($"Unsupported pixel format '{bitmap.PixelFormat}'.");
+
+        bitmap.UnlockBits(data);
+
+        return image;
+    }
+}

HPPH.System.Drawing/ImageHelper.cs

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+using System.Drawing;
+using System.Runtime.Versioning;
+
+namespace HPPH.System.Drawing;
+
+public static class ImageHelper
+{
+    [SupportedOSPlatform("windows")]
+    public static IImage LoadImage(string path)
+    {
+        using Bitmap bmp = new(path);
+        return bmp.ToImage();
+    }
+
+    [SupportedOSPlatform("windows")]
+    public static IImage LoadImage(Stream stream)
+    {
+        using Bitmap bmp = new(stream);
+        return bmp.ToImage();
+    }
+}