Added composer package

.gitignore

 .idea
+
+/vendor/

composer.json

+{
+    "name": "petr_kuril/kphp_cron-expression",
+    "description": "Cron Parser for KPHP",
+    "type": "library",
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Johnny Dealer",
+            "email": "Johnny_Dealer@mail.ru"
+        }
+    ],
+    "minimum-stability": "alpha",
+    "require": {}
+}