PHP katas with Pest PHP

PHP code katas, tested with Pest PHP. Based on exercises from Exercism.io.

Includes:

Anagrams: select an anagram for a word from a list of condidates.
Bob: returns different responses based on input.
Bowling: calculate the score for a game of bowling.
Grade School: given students' names along with the grade that they are in, create a roster for the school.
Roman numerals: convert a number into its roman numeral value.