Refactored greetingTab directive code from app.js to greeting-tab.js in the greeting-tab folder as a new module greetingTab. The modules is added as a dependency of the main module greetingsJS and greeting-tab.js linked from index.html
Refactored the new greeting form feature as a new directive greetingForm in the module greetingForm. Defined in folder greeting-form as greeting-form.js together with greeting-form.html containing the corresponding html partial. Linked new module from main one and linked greeting-tab.js from index.html