Add Philippus' solution for day 06 (#747)

docs/2024/puzzles/day06.md

@@ -227,6 +227,7 @@ https://adventofcode.com/2024/day/6
 - [Solution](https://github.com/Jannyboy11/AdventOfCode2024/blob/master/src/main/scala/day06/Day06.scala) of [Jan Boerman](https://x.com/JanBoerman95)
 - [Solution](https://github.com/profunctor-optics/advent-2024/blob/main/src/main/scala/advent2024/Day06.scala) by [Georgi Krastev](https://github.com/joroKr21)
 - [Solution](https://github.com/jportway/advent2024/blob/master/src/main/scala/Day6.scala) by [Joshua Portway](https://github.com/jportway)
+- [Solution](https://github.com/Philippus/adventofcode/blob/main/src/main/scala/adventofcode2024/Day06.scala) by [Philippus Baalman](https://github.com/philippus)
 
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