First version of Vocaber app

First version of Vocaber app 🎉

What has changed:

• the app was created 😉
• user can now load custom data file (with terms, definitions and images)
• the application tests user on provided terms and definitions using text input
• each question uses a provided image or a default one
• after receiving a correct answer, a random message is displayed
• after answering all questions the score is displayed
• Linux installation is available

Application remains under development - major changes are expected to appear in the future.