Ajout du model expert

Co-authored-by: Kara Diaby <kdiaby.pro@gmail.com>

app/models/expert.rb

@@ -0,0 +1,11 @@
+# == Schema Information
+#
+# Table name: experts
+#
+#  id         :bigint           not null, primary key
+#  created_at :datetime         not null
+#  updated_at :datetime         not null
+#
+class Expert < ApplicationRecord
+  has_one :user
+end