CODEOWNERS: Add myself for hash

Author: TimWolla

CODEOWNERS

@@ -9,6 +9,7 @@
 # https://docs.github.com/en/repositories/managing-your-repositorys-settings-and-features/customizing-your-repository/about-code-owners
 
 /reference/dom @nielsdos
+/reference/hash @TimWolla
 /reference/libxml @nielsdos
 /reference/mysqli @kamil-tekiela
 /reference/mysqlnd @kamil-tekiela