Clean console output a bit
Add staring time and elapsed time as metrics
Use golang mixedCaps in methods
Initialize start variable at the beginning
Create an elapsedTime function

This function was created to dry up the code a bit. The function will receive the application start time variable and return a time duration variable, this variable is displayed to the user in the shell.
Create a catchUserInterrupt function

This function will catch system interruptions probably done by the user with a SIGINIT and will print the total time that he spent using gomodoro.
Fix print string start time