Add ParksController show action

app/controllers/api/v1/parks_controller.rb

@@ -1,5 +1,6 @@
 class Api::V1::ParksController < ApplicationController
   DEFAULT_PAGE_SIZE = 10
+  before_action :set_park, only: :show
 
   def index
     parks = Park.all
@@ -9,6 +10,10 @@ class Api::V1::ParksController < ApplicationController
     render json: parks.limit(per_page).offset((page - 1) * per_page)
   end
 
+  def show
+    render json: @park
+  end
+
   private
 
   def per_page
@@ -18,4 +23,9 @@ class Api::V1::ParksController < ApplicationController
   def page
     (params[:page].presence || 1).to_i
   end
+
+  def set_park
+    @park = Park.find_by(code: params[:code])
+    head :not_found unless @park.present?
+  end
 end