Add composer scripts and box file

box.json

@@ -0,0 +1,5 @@
+{
+    "base-path": null,
+    "output": "build/extension-check.phar",
+    "chmod": "0700"
+  }

composer.json

@@ -43,5 +43,19 @@
     "config": {
         "preferred-install": "dist",
         "sort-packages": true
+    },
+    "scripts": {
+        "check": [
+            "./vendor/bin/phpcbf",
+            "./vendor/bin/phpcs",
+            "./vendor/bin/phpstan analyse"
+        ],
+        "test" : [
+            "./vendor/bin/phpunit tests"
+        ]
+    },
+    "scripts-descriptions": {
+        "check": "Check the sources for problems and style violations",
+        "test": "Run all tests"
     }
 }