update readme progess

Author: ArcticXWolf

README.md

@@ -31,6 +31,7 @@ Solutions for [Advent of Code](https://adventofcode.com/) in [Rust](https://www.
 | [Day 20](https://adventofcode.com/2022/day/20) | ⭐ | ⭐ |
 | [Day 21](https://adventofcode.com/2022/day/21) | ⭐ | ⭐ |
 | [Day 22](https://adventofcode.com/2022/day/22) | ⭐ | ⭐ |
+| [Day 23](https://adventofcode.com/2022/day/23) | ⭐ | ⭐ |
 <!--- advent_readme_stars table --->
 
 ## Friends