Added Aspire

Lutra/Lutra.Domain/Entities/BaseEntity.cs

@@ -0,0 +1,14 @@
+namespace Lutra.Domain.Entities;
+
+public abstract class BaseEntity
+{
+    public Guid Id { get; set; }
+
+    public DateTime CreatedAt {  get; set; }
+
+    public DateTime ModifiedAt { get; set; }
+
+    public DateTime? DeletedAt { get; set; }
+
+    public bool IsDeleted => DeletedAt.HasValue;
+}