Add range query doc.

docs/Query/Range.md

+# Range Query
+
+> More info about range query is in the [official elasticsearch docs][1]
+
+Matches documents with fields that have terms within a certain range.
+
+## Simple example
+
+```JSON
+{
+    {
+        "range" : {
+            "age" : {
+                "gte" : 10,
+                "lte" : 20,
+                "boost" : 2.0
+            }
+        }
+    }
+}
+```
+
+In DSL:
+
+```php
+$rangeQuery = new RangeQuery(
+    'age',
+    [
+        'gte' => 10,
+        'lte' => 20,
+        'boost' => 2.0,
+    ]
+);
+
+$search = new Search();
+$search->addQuery($rangeQuery);
+
+$queryArray = $search->toArray();
+```
+
+[1]: https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-range-query.html