Add notes in README for install_method
Add notes in README for install_method

jonaldomo/mongodb-cookbook,j00p34/mongodb-cookbook,chef-brigade/mongodb-cookbook,vkhatri/mongodb-cookbook,sous-chefs/mongodb,j00p34/mongodb-cookbook,mike623/mongodb,mike623/mongodb,chef-brigade/mongodb-cookbook,mike623/mongodb,SilkStart/mongodb-cookbook,vkhatri/mongodb-cookbook,chrisduong/mongodb-cookbook,ajkeys/mongodb-cookbook,chef-brigade/mongodb-cookbook,mike623/mongodb,sous-chefs/mongodb,SilkStart/mongodb-cookbook,jonaldomo/mongodb-cookbook,jonaldomo/mongodb-cookbook,ajkeys/mongodb-cookbook,chrisduong/mongodb-cookbook,luishdez/mongodb-cookbook,luishdez/mongodb-cookbook,j00p34/mongodb-cookbook,vkhatri/mongodb-cookbook,luishdez/mongodb-cookbook,SilkStart/mongodb-cookbook,sous-chefs/mongodb,ajkeys/mongodb-cookbook,chrisduong/mongodb-cookbook,mike623/mongodb