add user cla show

app/controllers/users/clas_controller.rb

@@ -4,6 +4,10 @@ class Users::ClasController <  Users::BaseController
     def index
         @user_clas = UserCla.where(user: current_user)
     end
+    
+    def show
+        @user_cla = current_user.user_clas.find params[:id]
+    end
 
     def create
         @user_cla = current_user.user_clas.find_by(cla_id: params[:cla_id])