added screenshots to readme
added screenshots to readme

lingqingmeng/preorder,quintendf/node_stripe,kolbeypruitt/mtm_official,kolbeypruitt/mtm_official,quintendf/node_stripe,SarahNoel/node-stripe-charge,jpca999/node-stripe-charge,amberwoodrow/node-stripe-charge,mjhea0/node-stripe-charge,lingqingmeng/preorder,jpca999/node-stripe-charge,mjhea0/node-stripe-charge,amberwoodrow/node-stripe-charge,SarahNoel/node-stripe-charge,yalcindo/stripeFromMike,yalcindo/stripeFromMike