Update README.md to include build and gem version badges for better visibility of project status

Author: OuYangJinTing

README.md

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 # Grape::Entity::Preloader
 
+[![Ruby](https://github.com/OuYangJinTing/grape-entity-preloader/actions/workflows/main.yml/badge.svg)](https://github.com/OuYangJinTing/grape-entity-preloader/actions/workflows/main.yml)
+[![Gem Version](https://badge.fury.io/rb/grape-entity-preloader.svg?icon=si%3Arubygems&icon_color=%23ff0000)](https://badge.fury.io/rb/grape-entity-preloader)
+
 Grape::Entity::Preloader allows preload associations and callbacks for avoiding N+1 operations in Grape::Entity.
 
 ## Installation