Added examples to documentation

Updated docs and fixed typos

Added cli option evaluation and error management. Updated docs in READMEmd

Removed unused template files

added "function" to functions for easier readability

Added usage function

Added validate options in script and usage in readme

Added function to check if a new backup is needed or not

created install-unit-files and uninstall-unit-files functions

fixed typo

Created function to write a file and to create default configuration file

Create function to write text to file

translated defaut configuration comments and rearrangement

Translate comments from Italian to English

Refactoring of the code for easier testing