3386: Add FreeBSD instructions r=heinrich5991 a=def-

https://www.freshports.org/games/DDNet

Thanks to @AMDmi3. Not sure if "pkg install DDNet" can also be used.

<!-- What is the motivation for the changes of this pull request -->

## Checklist

- [ ] Tested the change ingame
- [ ] Provided screenshots if it is a visual change
- [ ] Tested in combination with possibly related configuration options
- [ ] Written a unit test if it works standalone, system.c especially
- [ ] Considered possible null pointers and out of bounds array indexing
- [ ] Changed no physics that affect existing maps
- [ ] Tested the change with [ASan+UBSan or valgrind's memcheck](https://github.com/ddnet/ddnet/#using-addresssanitizer--undefinedbehavioursanitizer-or-valgrinds-memcheck) (optional)


Co-authored-by: def <dennis@felsin9.de>
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bors[bot] 2020-12-08 18:13:26 +00:00 committed by GitHub
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@ -219,6 +219,12 @@ Arch Linux
$ yay -S ddnet
```
FreeBSD
```bash
$ pkg install DDNet
```
Benchmarking
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