added admin part with password protected map and supporter list UNTESTED

app/controllers/admin/application_controller.rb

@@ -0,0 +1,3 @@
+class Admin::ApplicationController < ApplicationController
+  http_basic_authenticate_with name: "admin", password: ENV['ADMIN_PASSWORD'] unless Rails.env.development?
+end

app/controllers/admin/pages_controller.rb

@@ -0,0 +1,5 @@
+class Admin::PagesController < Admin::ApplicationController
+  def map
+    @supporters = Supporter.where(:coordinates.ne => nil).only(:coordinates, :support)
+  end
+end

app/controllers/admin/supporters_controller.rb

@@ -0,0 +1,5 @@
+class Admin::SupportersController < Admin::ApplicationController
+  def index
+    @supporters = Supporter.desc(:created_at)
+  end
+end