Add test script to run phpunit and phpcs

Author: emsifa

Diff for: composer.json

@@ -25,5 +25,11 @@
   "require-dev": {
     "phpunit/phpunit": "^6.5",
     "squizlabs/php_codesniffer": "^3"
+  },
+  "scripts": {
+    "test": [
+        "phpunit",
+        "phpcs"
+    ]
   }
 }

Diff for: phpcs.xml

@@ -0,0 +1,17 @@
+<?xml version="1.0"?>
+<ruleset name="Rakit validation coding standard">
+    <description>Rakit validation coding standard</description>
+
+    <!-- display progress -->
+    <arg value="p"/>
+    <!-- use colors in output -->
+    <arg name="colors"/>
+
+    <!-- inherit rules from: -->
+    <rule ref="PSR2"/>
+    <rule ref="Generic.Arrays.DisallowLongArraySyntax"/>
+
+    <!-- Paths to check -->
+    <file>src</file>
+    <file>tests</file>
+</ruleset>