size() method implemented

Author: me-shaon

README.md

@@ -316,6 +316,10 @@ const Q = new jsonQ(JsonObject).from('products').count();
 
 See detail example [here](examples/count.js).
 
+### `size()`
+
+This is an alias method of `count()`.
+
 ### `max(property)`
 
 * `property` -- the property name of the data

index.js

@@ -293,6 +293,15 @@ class JSJsonQ {
  return this._jsonContent.length;
  }
 
+ /**
+ * size - returns the size of the collection
+ *
+ * @returns {int}
+ */
+ size() {
+ return this.count();
+ }
+
  /**
  * max - If a 'property' given as parameter this method will return the maximum
  * value of the collection contains that property, otherwise it will assume