add phpcs to project and integrate it into travis-ci configuration

Author: arkadiusjonczek

.travis.yml

@@ -26,4 +26,5 @@ before_script:
   - composer install
 
 script:
-  - composer test
+  - composer cs
+  - composer test

composer.json

@@ -1,7 +1,14 @@
 {
     "name": "babymarkt/deepl-php-lib",
-    "description": "DeepL API Client Library supporting PHP >= 5.3 && PHP < 8.0",
     "type": "library",
+    "description": "DeepL API Client Library supporting PHP >= 5.3 && PHP < 8.0",
+    "keywords": [
+      "babymarkt",
+      "deepl",
+      "i18n",
+      "translation"
+    ],
+    "homepage": "https://github.com/Baby-Markt/deepl-php-lib",
     "license": "MIT",
     "authors": [
         {
@@ -14,7 +21,8 @@
     },
     "require-dev": {
         "php": ">=5.3 <8.0",
-        "phpunit/phpunit": "^4.8"
+        "phpunit/phpunit": "^4.8",
+        "squizlabs/php_codesniffer": "^2.9"
     },
     "autoload": {
         "psr-4": {
@@ -27,8 +35,10 @@
         }
     },
     "scripts": {
-        "test": [
-          "vendor/bin/phpunit"
-        ]
+        "test": "vendor/bin/phpunit",
+        "cs": "vendor/bin/phpcs src tests"
+    },
+    "config": {
+      "sort-packages": true
     }
-}
+}

phpcs.xml.dist

@@ -0,0 +1,14 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<ruleset name="babymarkt/deepl-php-lib">
+    <description>The coding standard of deepl-php-lib package</description>
+    <arg value="p" />
+
+    <config name="ignore_warnings_on_exit" value="1" />
+    <config name="ignore_errors_on_exit" value="1" />
+
+    <arg name="colors" />
+    <arg value="s" />
+
+    <!-- Use the PSR2 Standard-->
+    <rule ref="PSR2" />
+</ruleset>