Add feature/Password generator

[ahelmy]

Add Password generator feature.
DoD:

• Add psswd command that has default flags as below:
• -l length min = 1 and max = 2048
• -e include especial characters by default true or on and could be turned off by false or off.
• -n include numeric [0-9] by default true or on and could be turned off by false or off.
• -c include capitalized case by default true or on and could be turned off by false or off.