Add FreeBSD ports install option
Dependencies
Change contents
- edit in src/installing.md at line 126[2.838][4.308896]
Alternatively, you can install the [port](https://www.freshports.org/devel/pijul), which is more likely to be up-to-date but means you have to wait for `rust` and `pijul` to build from scratch:```cd /usr/ports/devel/pijul/ && make install clean```