docs: Update README.md with badge

README.md

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 [![License: MIT](https://img.shields.io/badge/License-MIT-blue.svg)](https://opensource.org/licenses/MIT)
 ![linting: pylint](https://img.shields.io/badge/linting-pylint-yellowgreen)
 ![linting: pylint](https://github.com/armandcismaru/DeepTrader-on-Threaded-BSE/actions/workflows/pylint.yml/badge.svg)
+[![CodeQL](https://github.com/armandcismaru/DeepTraderX/actions/workflows/github-code-scanning/codeql/badge.svg)](https://github.com/armandcismaru/DeepTraderX/actions/workflows/github-code-scanning/codeql)
 [![made-with-python](https://img.shields.io/badge/Made%20with-Python-1f425f.svg)](https://www.python.org/)
 
 This repository was created as part of my final individual project for the MEng Computer Science 4th year dissertation. It aims to explore the dynamics of a high performing, Deep Learning based trader, trained solely on data derived from the observation of Level-2 data from the Limit Order Book (LOB) of a simulated financial exchange. The project is using the [Threaded Bristol Stock Exchange (TBSE)](https://github.com/MichaelRol/Threaded-Bristol-Stock-Exchange) which was built with the purpose of replicating the asynchronous and parallel nature of real life markets, being a multithreaded extension of the [Bristol Stock Exchange (BSE)](https://github.com/davecliff/BristolStockExchange), created by Dave Cliff.