Add badges for servactory-rubocop gem version and release date.

Included badges for the gem version and release date of servactory-rubocop to the README.md. These badges provide quick visual information about the current version and release date directly from the GitHub repository.

README.md

@@ -13,6 +13,8 @@
 </p>
 
 <p align="center">
+  <a href="https://rubygems.org/gems/servactory-rubocop"><img src="https://img.shields.io/gem/v/servactory-rubocop?logo=rubygems&logoColor=fff" alt="Gem version"></a>
+  <a href="https://github.com/servactory/servactory-rubocop/releases"><img src="https://img.shields.io/github/release-date/servactory/rubocop" alt="Release Date"></a>
   <a href="https://rubygems.org/gems/servactory"><img src="https://img.shields.io/gem/v/servactory?logo=rubygems&logoColor=fff" alt="Gem version"></a>
   <a href="https://github.com/servactory/servactory/releases"><img src="https://img.shields.io/github/release-date/servactory/servactory" alt="Release Date"></a>
 </p>