update readme

Author: JackerNgo

README.md

@@ -1,5 +1,8 @@
-## Documentation
+## How to install
+Run the following command in Magento 2 root folder:
 
-- Installation guide: https://www.mageplaza.com/install-magento-2-extension/#solution-1-ready-to-paste
-- User guide: https://docs.mageplaza.com/automatic-related-products/
-- Report a security issue to security@mageplaza.com
+```
+composer require mageplaza/module-automatic-related-products-graphql
+php bin/magento setup:upgrade
+php bin/magento setup:static-content:deploy
+```