JavaScript file implementation facts.

• gather_img.js: when clicking the green-button(success button) we collect the image source file that have to be sent to the customers. The collected image source url is stored on the local storage.
• login.js, logout.js: these scripts make us to manage UID of the firebase so that each user can have different cards and customers settings.
• makerealcard.js : this script gathers total four images that have to be given to make a card. When collect a card, it makes a final card and then make a description with youtube link.
• Send.js: this script reads the customers from the database and show the already stored customer information such as name and email address. When click the send button, it sends emails through the default email sending application of the system(the users' devices)