Add notices

app/controllers/contests_controller.rb

@@ -40,7 +40,7 @@ class ContestsController < ApplicationController
     @contest = Contest.new(contest_params)
     @contest.user_id = current_user.id
     if @contest.save
-      redirect_to @contest
+      redirect_to @contest, notice: t("contests.new.notice")
     else
       render :new, status: :unprocessable_entity
     end
@@ -50,7 +50,7 @@ class ContestsController < ApplicationController
     authorize @contest
 
     if @contest.update(contest_params)
-      redirect_to @contest
+      redirect_to @contest, notice: t("contests.edit.notice")
     else
       @action_name = t("helpers.buttons.back")
       @action_path = contest_path(@contest)
@@ -60,6 +60,9 @@ class ContestsController < ApplicationController
 
   def destroy
     authorize @contest
+
+    @contest.destroy
+    redirect_to contests_path, notice: t("contests.destroy.notice")
   end
 
   def scoreboard