Add command line arguments & manpage

We should have some functionality that lets the user view some basic info/configuration via the command line.

Something like:

```
falsr --version
```

Should print some information about the version. See for example Rust's convention:

```
rustc 1.66.1 (90743e729 2023-01-10)
```

Along the same lines there should be a manpage that can be obtained via:

```
man faslr
```