Add Docker badge to README

Included a Docker shield badge in the README to highlight Docker support or usage. This improves the README's clarity about the technologies or tools associated with the project.

Author: nicholasadamou

README.md

@@ -2,6 +2,7 @@
 
 ![Python](https://img.shields.io/badge/-Python-3776AB?style=flat-square&logo=python&logoColor=white)
 ![GraphQL](https://img.shields.io/badge/-GraphQL-E10098?style=flat-square&logo=graphql&logoColor=white)
+![Docker](https://img.shields.io/badge/-Docker-2496ED?style=flat-square&logo=docker&logoColor=white)
 ![LeetCode](https://img.shields.io/badge/-LeetCode-FF4B00?style=flat-square&logo=leetcode&logoColor=white)
 
 ![squidleet](https://socialify.git.ci/daily-coding-problem/squidleet/image?language=1&description=1&forks=1&issues=1&name=1&owner=1&pattern=Circuit+Board&pulls=1&stargazers=1&theme=Dark)