Update README.md

README.md

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 # AzAppRegistrationExpiry
+
+A simple python app to warn of upcoming App Registration Secret / Password Expiry on Azure Entra ID.
+
+## Installation
+
+Requires Python 3.12  
+Install requirements from requirements.txt
+
+```bash
+pip install -r requirements.txt
+```
+
+## Usage
+
+Amend the credentials in .env to match your environment.  
+You will need to create an App Registration with API Permissions:  
+- Application.ReadWrite.All  
+- Files.ReadWrite.All
+- Sites.ReadWrite.All
+- User.Read
+- User.Read.All  
+
+Create an Excel Sheet within Business OneDrive and add the ID to the .env file  
+Add SMTP Sending details to .env (AWS Simple E-Mail Service was used in development)  
+
+
+```python
+python main.py
+```
+
+## Contributing
+
+Pull requests are welcome. For major changes, please open an issue first
+to discuss what you would like to change.