Updated PHP version for PHP7.2+

Removed PHP5 (no longer supported)
Renamed PHP7 to PHP - consistent with other kata
Added the same helpers as other PHP Kata
Updated the code to PHP7.2+ standard
Didn't change GildedRose updateQuality method
Updated GildedRoseTest (still failing)
Added ApprovalTest (passing)
- same text file as texttests / ThirtyDays / stdout.gr (only renamed).

php/composer.json

@@ -0,0 +1,35 @@
+{
+    "name": "emilybache/gilded-rose-refactoring-kata",
+    "description": "A kata to practice refactoring, tests and polymorphism",
+    "require": {
+        "php": "^7.2"
+    },
+    "autoload": {
+        "psr-4": {
+            "GildedRose\\": "src/"
+        }
+    },
+    "autoload-dev": {
+        "psr-4": {
+            "Tests\\": "tests/"
+        }
+    },
+    "require-dev": {
+        "phpunit/phpunit": "^8.0",
+        "phpstan/phpstan": "^0.12.23",
+        "phpstan/phpstan-phpunit": "^0.12.8",
+        "symplify/easy-coding-standard": "^7.3",
+        "symplify/phpstan-extensions": "^7.3",
+        "approvals/approval-tests": "^1.4"
+    },
+    "scripts": {
+        "checkcode": "phpcs src tests --standard=PSR12",
+        "fixcode": "phpcbf src tests --standard=PSR12",
+        "test": "phpunit",
+        "tests": "phpunit",
+        "test-coverage": "phpunit --coverage-html build/coverage",
+        "check-cs": "ecs check src tests --ansi",
+        "fix-cs": "ecs check src tests --fix --ansi",
+        "phpstan": "phpstan analyse --ansi"
+    }
+}