changed README to markdown format and added deprecation notice
changed README to markdown format and added deprecation notice

pgroudas/cookbooks,dagolden/opscode-cookbooks,gravitystorm/cookbooks,gravitystorm/cookbooks,DataDog/opscode-cookbooks,dagolden/opscode-cookbooks,beni55/cookbooks,pgroudas/cookbooks,beni55/cookbooks,dbroeglin/cookbooks,beni55/cookbooks,pcreux/cookbooks,dbroeglin/cookbooks,gravitystorm/cookbooks,beni55/cookbooks,beni55/cookbooks,dagolden/opscode-cookbooks,beni55/cookbooks,pcreux/cookbooks,pgroudas/cookbooks,DataDog/opscode-cookbooks,dbroeglin/cookbooks,DataDog/opscode-cookbooks,pcreux/cookbooks