Command line password generator.
By default, the program generates 10 passwords with a length of 12 characters consisting of numbers and upper and lower case letters.
python3 passgen.py -<options> <password_length> <count_of_passwords>
If you do not specify options, the syntax will be look like this:
python3 passgen.py <password_length> <count_of_passwords>
If you do not specify the count, 10 passwords will be generated.
Also the syntax may look like this:
python3 passgen.py -<options> <password_length>
u - use Uppercase letters
n - use numbers
s - use special symbols
