[GraphQl] Improve code, change readme file and add i18n file

Author: LuongNgoDoan

Model/Resolver/AbstractAttributes.php

@@ -33,16 +33,8 @@
  * Class AbstractAttributes
  * @package Mageplaza\CustomerAttributesGraphQl\Model\Resolver
  */
-class AbstractAttributes implements ResolverInterface
+abstract class AbstractAttributes implements ResolverInterface
 {
-    /**
-     * @inheritdoc
-     */
-    public function resolve(Field $field, $context, ResolveInfo $info, array $value = null, array $args = null)
-    {
-        // TODO: Implement resolve() method.
-    }
-
     /**
      * @param array $args
      *

README.md

@@ -28,10 +28,6 @@ To perform GraphQL queries in Magento, please do the following requirements:
 - [Customer Attributes API & examples](https://documenter.getpostman.com/view/10589000/T1DqgH2g?version=latest)
 - [Customer Attributes GraphQL & examples](https://documenter.getpostman.com/view/10589000/TVYJ5GmN)
 
-Click on Run in Postman for add these collections to your workspace quickly.
-
-![Magento 2 customer attributes graphql pwa](https://imgur.com/0lz0vMU.gif)
-
 
 ## 4. Contribute to this module
 

i18n/en_US.csv

@@ -0,0 +1,3 @@
+"currentPage value must be greater than 0.","currentPage value must be greater than 0."
+"pageSize value must be greater than 0.","pageSize value must be greater than 0."
+"currentPage value %1 specified is greater than the %2 page(s) available.","currentPage value %1 specified is greater than the %2 page(s) available."