Add missing README.md

Author: sebastienrousseauhsbc

encryption_helper/utils/README.md

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+<!-- markdownlint-disable MD033 MD041 -->
+<p align="center">
+  <img src="https://www.hsbc.com/-/files/hsbc/header/hsbc-logo-200x25.svg" alt="HSBC Logo" width="200" title="HSBC Logo">
+</p>
+
+<h1 align="center">Encryption Helper Python</h1>
+
+<p align="center">
+  <img src="../../assets/banner.jpg" alt="Encryption Helper Banner">
+</p>
+
+<h2 align="center">Checks and I/O Modules Overview</h2>
+
+<p align="center">
+  <strong>This package includes various modules for encryption helper functionalities.</strong>
+</p>
+
+<p align="center">
+  <a href="#checks-module">Checks Module</a> •
+  <a href="#io-modules">I/O Modules</a> •
+  <a href="#license">License</a>
+</p>
+<!-- markdownlint-enable MD033 MD041 -->
+
+## Checks Module
+
+The Checks module in the `encryption_helper` package provides utility functions for input validation.
+
+For detailed documentation, please refer to the `README.md` file in the respective folder:
+
+- [Checks Module](checks/README.md)
+
+## I/O Modules
+
+The I/O modules in the `encryption_helper` package provide functionalities for reading and writing files in binary mode.
+
+- **Read File Module**: Functions to read text files in binary mode.
+- **Write File Module**: Functions to write text files in binary mode.
+
+For detailed documentation, please refer to the `README.md` files in the respective folders:
+
+- [Read File Module](io/README.md)
+- [Write File Module](io/README.md)
+
+## License
+
+This project is licensed under the MIT License. See the [LICENSE](../../LICENSE) file for details.