Interactively ask all the values for first time setup and other UX improvements

[navilg]

When the script is run for first time:

• Ask for all the details required in .properties file interactively.
• Store the details in godaddy-ddns.properties file.
• Interactive session should not be enabled when the script is run by cron job.
• User should have access to update the details in case he need it in future by manually running same script.

e.g. To setup for first time interactivley, User can run: sudo bash godaddy-ddns.sh setup

To update the properties, User can run: sudo bash godaddy-ddns.sh update

When cronjob runs this script, It should run as: sudo bash godaddy-ddns.sh nointeraction

When user or cron runs the script, without any argument or any other argument which do not have any action associated to it. It should print a message with help page and example and exit the script.

[navilg]

Added cli way to add, update, delete and list records. Available in v1.0.0