feat: Initialize URLNotesGrabberCORE project with core application structure, data access, and configuration.

URLNotesGrabberCORE/EmptyArrayOrObjectConverter.cs

@@ -0,0 +1,29 @@
+using System;
+using Newtonsoft.Json;
+using Newtonsoft.Json.Linq;
+
+namespace URLNotesGrabberCORE
+{
+    public class EmptyArrayOrObjectConverter<T> : JsonConverter
+    {
+        public override bool CanConvert(Type objectType)
+        {
+            return objectType == typeof(T);
+        }
+
+        public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
+        {
+            JToken token = JToken.Load(reader);
+            if (token.Type == JTokenType.Array)
+            {
+                return null;
+            }
+            return token.ToObject<T>(serializer);
+        }
+
+        public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
+        {
+            serializer.Serialize(writer, value);
+        }
+    }
+}