Add doc region showing connecting to MySQL database

Author: remi Taylor

appengine/cloudsql/app.rb

@@ -17,10 +17,12 @@
 require "sinatra"
 require "sequel"
 
+# [START connect]
 DB = Sequel.mysql2 user:     ENV["MYSQL_USER"],
                    password: ENV["MYSQL_PASSWORD"],
                    database: ENV["MYSQL_DATABASE"],
                    socket:   ENV["MYSQL_SOCKET_PATH"]
+# [END connect]
 
 get "/" do
   # Save visit in database