Add installation and example to readme
Add installation and example to readme

cherrytech/omnipay-paypal,Namek/omnipay-paypal,delatbabel/omnipay-paypal,Namek/omnipay-paypal,thephpleague/omnipay-paypal,thephpleague/omnipay-paypal,burzum/omnipay-paypal,delatbabel/omnipay-paypal,burzum/omnipay-paypal