Add stub of alerts route

app/controllers/api/v1/parks/alerts_controller.rb

@@ -0,0 +1,4 @@
+module Api::V1::Parks
+  class AlertsController < BaseController
+  end
+end

app/controllers/api/v1/parks/base_controller.rb

@@ -0,0 +1,12 @@
+module Api::V1::Parks
+  class BaseController < ApplicationController
+    before_action :set_park
+
+    private
+
+    def set_park
+      @park = Park.find_by(code: params[:park_code])
+      head :not_found unless @park.present?
+    end
+  end
+end