Added SDK and tests

Passwordless-dotnet.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.0.31903.59
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Sdk.Tests", "Tests\Sdk.Tests\Sdk.Tests.csproj", "{F64C850E-9923-43F1-BC84-432AFBBA4425}"
+EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Sdk", "src\Sdk\Sdk.csproj", "{A01503A8-6AB9-43A7-AC5A-4EAE091B07B6}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{F64C850E-9923-43F1-BC84-432AFBBA4425}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{F64C850E-9923-43F1-BC84-432AFBBA4425}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{F64C850E-9923-43F1-BC84-432AFBBA4425}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{F64C850E-9923-43F1-BC84-432AFBBA4425}.Release|Any CPU.Build.0 = Release|Any CPU
+		{A01503A8-6AB9-43A7-AC5A-4EAE091B07B6}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{A01503A8-6AB9-43A7-AC5A-4EAE091B07B6}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{A01503A8-6AB9-43A7-AC5A-4EAE091B07B6}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{A01503A8-6AB9-43A7-AC5A-4EAE091B07B6}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(NestedProjects) = preSolution
+	EndGlobalSection
+EndGlobal

src/Sdk/Helpers/Json.cs

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+using System.Text.Json;
+
+namespace Passwordless.Net.Helpers;
+
+internal static class Json
+{
+    public static readonly JsonSerializerOptions Options = new(JsonSerializerDefaults.Web);
+}

src/Sdk/Models/AliasPointer.cs

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+namespace Passwordless.Net;
+
+public class AliasPointer
+{
+    public string UserId { get; set; }
+    public string Alias { get; set; }
+    public string Plaintext { get; set; }
+}

src/Sdk/Models/AuditLog.cs

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+namespace Passwordless.Net;
+
+public class AuditLog
+{
+    public DateTime Timestamp { get; set; }
+    public string Level { get; set; }
+    public string Message { get; set; }
+    public string Details { get; set; }
+}

src/Sdk/Models/Credential.cs

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+namespace Passwordless.Net;
+
+public class Credential
+{
+    public CredentialDescriptor Descriptor { get; set; }
+    public byte[] PublicKey { get; set; }
+    public byte[] UserHandle { get; set; }
+    public uint SignatureCounter { get; set; }
+    public string AttestationFmt { get; set; }
+    public DateTime CreatedAt { get; set; }
+    public Guid AaGuid { get; set; }
+    public DateTime LastUsedAt { get; set; }
+    public string RPID { get; set; }
+    public string Origin { get; set; }
+    public string Country { get; set; }
+    public string Device { get; set; }
+    public string Nickname { get; set; }
+    public string UserId { get; set; }
+}

src/Sdk/Models/CredentialDescriptor.cs

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+using System.Text.Json.Serialization;
+
+using static Passwordless.Net.PasswordlessClient;
+
+namespace Passwordless.Net;
+
+public class CredentialDescriptor
+{
+    [JsonConverter(typeof(Base64UrlConverter))]
+    public byte[] Id { get; set; }
+}

src/Sdk/Models/NewAppOptions.cs

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+namespace Passwordless.Net;
+
+public class NewAppOptions
+{
+    public string AppId { get; set; } = "";
+    public string AdminEmail { get; set; } = "";
+}

src/Sdk/Models/NewAppResponse.cs

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+namespace Passwordless.Net;
+
+public class NewAppResponse
+{
+    public string Message { get; set; }
+    public string ApiKey1 { get; set; }
+    public string ApiKey2 { get; set; }
+    public string ApiSecret1 { get; set; }
+    public string ApiSecret2 { get; set; }
+}

src/Sdk/Models/PasswordlessUserSummary.cs

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+namespace Passwordless.Net;
+
+public class PasswordlessUserSummary
+{
+    public string UserId { get; set; }
+    public List<string> Aliases { get; set; }
+    public int CredentialsCount { get; set; }
+    public int AliasCount { get; set; }
+    public DateTime LastUsedAt { get; set; }
+}

src/Sdk/Models/RegisterOptions.cs

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+namespace Passwordless.Net;
+
+public class RegisterOptions
+{
+    public required string UserId { get; set; }
+    public string? DisplayName { get; set; }
+    public required string Username { get; set; }
+    public string Attestation { get; set; }
+    public string AuthenticatorType { get; set; }
+    public bool Discoverable { get; set; }
+    public string UserVerification { get; set; }
+    public HashSet<string>? Aliases { get; set; }
+    public bool AliasHashing { get; set; }
+
+    public DateTime ExpiresAt { get; set; }
+}

src/Sdk/Models/UsersCount.cs

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+namespace Passwordless.Net;
+
+public class UsersCount
+{
+    public int Count { get; set; }
+}

src/Sdk/Models/VerifiedUser.cs

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+namespace Passwordless.Net;
+
+public class VerifiedUser
+{
+    public string UserId { get; set; }
+    public byte[] CredentialId { get; set; }
+    public bool Success { get; set; }
+    public DateTime Timestamp { get; set; }
+    public string RpId { get; set; }
+    public string Origin { get; set; }
+    public string Device { get; set; }
+    public string Country { get; set; }
+    public string Nickname { get; set; }
+    public DateTime ExpiresAt { get; set; }
+    public Guid TokenId { get; set; }
+    public string Type { get; set; }
+}

src/Sdk/PasswordlessApiException.cs

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+using System.Text.Json.Serialization;
+
+namespace Passwordless.Net;
+
+public sealed class PasswordlessApiException : HttpRequestException
+{
+    public ProblemDetails Details { get; }
+
+    public PasswordlessApiException(ProblemDetails problemDetails) : base(problemDetails.Title)
+    {
+        Details = problemDetails;
+    }
+}
+
+public class ProblemDetails
+{
+    // TODO: Make immutable
+    // TODO: Include errorCode as a property once it's more common
+    public string Type { get; set; } = null!;
+    public string Title { get; set; } = null!;
+    public int Status { get; set; }
+    public string? Detail { get; set; }
+    public string? Instance { get; set; }
+
+    [JsonExtensionData]
+    public Dictionary<string, object?> Extensions { get; set; }
+}