Merge pull request Azure-Samples#4 from vmagelo/main

Add to README, info about requirements

Author: vmagelo

README.md

@@ -5,3 +5,17 @@ This is a Python web app using the Flask framework and the Azure Database for Po
 If you need an Azure account, you can [create on for free](https://azure.microsoft.com/free/).
 
 A Django sample application is also available for the article at https://github.com/Azure-Samples/msdocs-django-postgresql-sample-app.
+
+## Requirements
+
+The [requirements.txt](./requirements.txt) has the following packages:
+
+| Package | Description |
+| ------- | ----------- |
+| [Flask](https://pypi.org/project/Flask/) | Web application framework. |
+| [SQLAlchemy](https://pypi.org/project/SQLAlchemy/) | Provides a database abstraction layer to communicate with PostgreSQL. |
+| [Flask-SQLAlchemy](https://pypi.org/project/Flask-SQLAlchemy/) | Adds SQLAlchemy support to Flask application by simplifying using SQLAlchemy. Requires SQLAlchemy. |
+| [Flask-Migrate](https://pypi.org/project/Flask-Migrate/) | SQLAlchemy database migrations for Flask applications using Alembic. Allows functionality parity with Django version of this sample app.|
+| [pyscopg2](https://pypi.org/project/psycopg2/) | PostgreSQL adapter for Python. |
+| [python-dotenv](https://pypi.org/project/python-dotenv/) | Read key-value pairs from .env file and set them as environment variables. In this sample app, those variables describe how to connect to the database locally. |
+| [flask_wtf](https://pypi.org/project/Flask-WTF/) | Form rendering, validation, and CSRF protection for Flask with WTForms. Uses CSRFProtect extension. |