freq

Counts [a-zA-Z]+ words in input and outputs frequency.

Uses Scala 2.13.x, Cats-Effect and FS2 streams for processing.

Running CLI

Run SBT:
```
$> sbt
```
From SBT console run app to get CLI help:
```
freq(master)> run --help
```
From SBT console:
```
freq(master)> run pg.txt out.txt
```