feat(objects): cnx 931 create archicadobject

src/Speckle.Objects/Data/ArchicadObject.cs

@@ -0,0 +1,19 @@
+using Speckle.Sdk.Models;
+
+namespace Speckle.Objects.Data;
+
+/// <summary>
+/// Represents a base class object in Archicad
+/// </summary>
+[SpeckleType("Objects.Data.ArchicadObject")]
+public class ArchicadObject : DataObject, IArchicadObject
+{
+  public required string type { get; set; }
+
+  public required string level { get; set; }
+
+  [DetachProperty]
+  public List<ArchicadObject> elements { get; set; }
+
+  IReadOnlyList<IArchicadObject> IArchicadObject.elements => elements;
+}

src/Speckle.Objects/Interfaces.cs

@@ -167,6 +167,15 @@ public interface IGisObject : IDataObject
   string type { get; }
 }
 
+public interface IArchicadObject : IDataObject
+{
+  string type { get; }
+
+  string level { get; }
+
+  IReadOnlyList<IArchicadObject> elements { get; }
+}
+
 public interface INavisworksObject : IDataObject { }