added composer.json file

composer.json

+{
+    "name": "ongr/elasticsearch-dsl",
+    "description": "Elasticsearch DSL library",
+    "type": "library",
+    "homepage": "http://ongr.io",
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "ONGR team",
+            "homepage": "http://www.ongr.io"
+        }
+    ],
+    "require": {
+        "php": ">=5.4",
+        "elasticsearch/elasticsearch": "~1.0"
+    },
+    "require-dev": {
+        "mikey179/vfsStream": "~1.4",
+        "phpunit/phpunit": "~4.4",
+        "squizlabs/php_codesniffer": "~2.0",
+        "ongr/ongr-strict-standard": "~2.0"
+    },
+    "autoload": {
+        "psr-4": { "ONGR\\ElasticsearchDSL\\": "src/" }
+    }
+}