add composer file

Author: JBlond

composer.json

@@ -0,0 +1,20 @@
+{
+    "name": "jblond/php-diff",
+    "type": "library",
+    "description": "A comprehensive library for generating differences between two hashable objects (strings or arrays).",
+    "authors": [
+        {
+            "name": "Chris Boulton",
+            "email": "@chrisboulton"
+        },
+        {
+            "name": "Mario",
+            "email": ""
+        }
+    ],
+    "autoload": {
+        "psr-0": {
+           "Diff": "lib/"
+        }
+    }
+}