chore: Added PHPCS and config

.editorconfig

@@ -0,0 +1,14 @@
+# editorconfig.org
+
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.php]
+indent_size = 4

composer.json

@@ -19,7 +19,9 @@
     "require-dev": {
         "phpunit/phpunit": "^9",
         "mockery/mockery": "^1.6",
-        "phpstan/phpstan": "^1"
+        "phpstan/phpstan": "^1",
+        "dealerdirect/phpcodesniffer-composer-installer": "^1.0",
+        "squizlabs/php_codesniffer": "^3.8"
     },
     "suggest": {
         "ext-exif": "Recommended to be able to read EXIF data properly."
@@ -34,5 +36,10 @@
         "psr-4": {
             "Intervention\\Image\\Tests\\": "tests"
         }
+    },
+    "config": {
+        "allow-plugins": {
+            "dealerdirect/phpcodesniffer-composer-installer": true
+        }
     }
 }

phpcs.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0"?>
+<ruleset name="Intervention/image">
+
+  <rule ref="PSR12"/>
+
+  <rule ref="Generic.Files.LineLength">
+    <severity>0</severity>
+  </rule>
+
+  <file>src/</file>
+</ruleset>