feature: first

NuGet/Models/CatalogEntry.cs

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+using System.Collections.Immutable;
+using NuGet.Versioning;
+
+namespace NuGet.Models;
+
+public record CatalogEntry(string Id, NuGetVersion Version, ImmutableArray<DependencyGroup> DependencyGroups, ImmutableArray<string>? PackageTypes,
+    ImmutableArray<CatalogPackageEntry>? PackageEntries);
+    
+public record CatalogPackageEntry(string Name, string FullName, long CompressedLength, long Length);

NuGet/Models/Dependency.cs

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+using NuGet.Versioning;
+
+namespace NuGet.Models;
+
+public record Dependency(string Id, VersionRange Range);

NuGet/Models/DependencyGroup.cs

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+using System.Collections.Immutable;
+using NuGet.Frameworks;
+
+namespace NuGet.Models;
+
+public record DependencyGroup(NuGetFramework TargetFramework, ImmutableArray<Dependency>? Dependencies = null);

NuGet/Models/NuGetIndex.cs

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+using NuGet.Versioning;
+
+namespace NuGet.Models;
+
+public record NuGetIndex(NuGetVersion Version, Resource[] Resources);

NuGet/Models/Registration.cs

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+using System.Text.Json.Serialization;
+
+namespace NuGet.Models;
+
+public record Registration([property: JsonPropertyName("catalogEntry")] string CatalogEntryUrl, 
+    [property: JsonPropertyName("sleet:catalogEntry")] CatalogEntry? SleetEntry);

NuGet/Models/RegistrationEntry.cs

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+namespace NuGet.Models;
+
+public record RegistrationEntry(CatalogEntry CatalogEntry);

NuGet/Models/RegistrationPage.cs

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+using NuGet.Versioning;
+
+namespace NuGet.Models;
+
+public record RegistrationPage(int Count, NuGetVersion Lower, NuGetVersion Upper, RegistrationEntry[] Items);

NuGet/Models/RegistrationRoot.cs

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+namespace NuGet.Models;
+
+public record RegistrationRoot(int Count, RegistrationPage[] Items);

NuGet/Models/Resource.cs

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+using System.Text.Json.Serialization;
+
+namespace NuGet.Models;
+
+public record Resource([property: JsonPropertyName("@id")] string Url, [property: JsonPropertyName("@type")] ResourceType Type, string? Comment);

NuGet/Models/ResourceType.cs

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+using System.Text.Json.Serialization;
+using NuGet.Converters;
+using NuGet.Versioning;
+
+namespace NuGet.Models;
+
+[JsonConverter(typeof(ResourceTypeJsonConverter))]
+public record ResourceType(string Id, NuGetVersion? Version)
+{
+    public static ResourceType Parse(string typeString)
+    {
+        var slash = typeString.IndexOf('/');
+        
+        if (slash < 0)
+            return new ResourceType(typeString, null);
+        
+        var id = typeString[..slash];
+        var versionStr = typeString[(slash + 1)..];
+
+        return NuGetVersion.TryParse(versionStr, out var version)
+            ? new ResourceType(id, version)
+            : new ResourceType(id, null);
+    }
+
+    public override string ToString() => $"{Id}/{Version}";
+}