Create WikiError

This is modeled after the errors we might receive from the wiki

app/errors/WikiError.rb

@@ -0,0 +1,18 @@
+# frozen_string_literal: true
+
+class WikiError < StandardError
+  def initialize(code: nil, page: nil, message: nil)
+    super
+    @code = code
+    @page = page
+    @message = message
+  end
+
+  def to_hash
+    {
+      message: @message,
+      code: @code,
+      page: @page
+    }
+  end
+end