Swikly and then you can pay

Adding new features for payments and Swik's informations:

• getSwik to have informations about only one Swik
• newPayment to ask a payment to your client
• newDirectPayment to create a payment flow from your website

Dev version 1.1.0

Add functionality getSwik() and improve error handling

Swikly the first

v1.0.0

Fix composer.json file and a README title