Generates random usernames using the Mersenne Twister 19937 engine.
## Format
The generated usernames have the format `<random letters><random numbers>`, with count of numbers and total length being randomly generated within a certain range, which can be adjusted via command line arguments.
## Parameters
The following parameters can be specified:
-`--min-char` : The minimum number of characters (including numbers) (default: 8)
-`--max-char` : The maximum number of characters (including numbers) (default: 10)
-`--min-num` : The minimum number of digits (default: 0)
-`--max-num` : The maximum number of digits (default: 4)
-`--count` : How many usernames should be generated (default: 1)
-`--seed` : String used as seed sequence. If not defined, system time will be used instead.
