Add Philippus' solution for day 8 (#415)

Co-authored-by: Jamie Thompson <[email protected]>

docs/2023/puzzles/day08.md

@@ -15,5 +15,6 @@ Share your solution to the Scala community by editing this page. (You can even w
 - [Solution](https://github.com/xRuiAlves/advent-of-code-2023/blob/main/Day8.scala) by [Rui Alves](https://github.com/xRuiAlves/)
 - [Solution](https://github.com/alexandru/advent-of-code/blob/main/scala3/2023/src/main/scala/day8.scala) by [Alexandru Nedelcu](https://github.com/alexandru/)
 - [Solution](https://github.com/bishabosha/advent-of-code-2023/blob/main/2023-day08.scala) by [Jamie Thompson](https://github.com/bishabosha)
+- [Solution](https://github.com/Philippus/adventofcode/blob/main/src/main/scala/adventofcode2023/Day08.scala) by [Philippus Baalman](https://github.com/philippus)
 
 Share your solution to the Scala community by editing this page. (You can even write the whole article!)