Feature/gift cards

[rodolforpr88]

• Create scaffold for gift_card_template and gift_card
• Create joinable table for gift_card_template_services
• Create the dropdowns views
• Create the test for the scaffolds, controller and model
• The gift_card_templates and gift_cards stylization follow the same model bellow

views/gift_card_templates/index

views/gift_card_templates/new

views/gift_card_templates/show