roll/README.md

# roll

for initiative!

## usage

```bash
$ roll 2d20
1 ..... 15
2 .....  9
total | 24

$ roll 5d4+2
1 .....  2
2 .....  2
3 .....  4
4 .....  1
5 .....  3
mod ..  +2
total | 14

$ roll 1d20
1 ..... 1
total | 1
critical miss!

$ roll 1d20+a # or 1d20+advantage
1a .... 19
1b ....  2
total | 19

$ roll
> 1d20
>> total: 12
> +5
>> total + 5: 17
```