added SpeckleException

Data/SpeckleException.cs

@@ -0,0 +1,45 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace SpeckleCore.Data
+{
+  public class SpeckleException : Exception
+  {
+    public SpeckleException()
+    {
+    }
+
+    public SpeckleException(string message)
+        : base(message)
+    {
+    }
+
+    public SpeckleException(string message, Exception inner)
+        : base(message, inner)
+    {
+    }
+  }
+
+  public class RevitFamilyNotFoundException : SpeckleException
+  {
+    public RevitFamilyNotFoundException()
+    {
+    }
+
+    public RevitFamilyNotFoundException(string message)
+        : base(message)
+    {
+    }
+
+    public RevitFamilyNotFoundException(string message, Exception inner)
+        : base(message, inner)
+    {
+    }
+  }
+}
+
+
+