feat: add included object to documents

Author: jaredcnance

src/JsonApiDotNetCore/Models/Document.cs

@@ -1,3 +1,4 @@
+using System.Collections.Generic;
 using Newtonsoft.Json;
 
 namespace JsonApiDotNetCore.Models
@@ -6,5 +7,8 @@ public class Document
     {
         [JsonProperty("data")]
         public DocumentData Data { get; set; }
+        
+        [JsonProperty("included")]
+        public List<DocumentData> Included { get; set; }
     }
 }

src/JsonApiDotNetCore/Models/DocumentData.cs

@@ -20,7 +20,6 @@ public string Type
 
         [JsonProperty("attributes")]
         public Dictionary<string, object> Attributes { get; set; }
-
 
         [JsonProperty("relationships")]
         public Dictionary<string, RelationshipData> Relationships { get; set; }

src/JsonApiDotNetCore/Models/Documents.cs

@@ -7,5 +7,8 @@ public class Documents
     {
         [JsonProperty("data")]
         public List<DocumentData> Data { get; set; }
+
+        [JsonProperty("included")]
+        public List<DocumentData> Included { get; set; }
     }
 }