Implemented DLSiteClient.

JSMR.Infrastructure/Integrations/DLSite/Serialization/DictionaryConverter.cs

@@ -0,0 +1,13 @@
+using System.Text.Json;
+using System.Text.Json.Serialization;
+
+namespace JSMR.Infrastructure.Integrations.DLSite.Serialization;
+
+public sealed class DictionaryConverter<TKey, TValue> : JsonConverter<Dictionary<TKey, TValue>> where TKey : notnull
+{
+    public override Dictionary<TKey, TValue>? Read(ref Utf8JsonReader reader, Type typeToConvert, JsonSerializerOptions options)
+        => JsonSerializer.Deserialize<Dictionary<TKey, TValue>>(ref reader, options);
+
+    public override void Write(Utf8JsonWriter writer, Dictionary<TKey, TValue> value, JsonSerializerOptions options)
+        => JsonSerializer.Serialize(writer, value, options);
+}