Implement postCreateCommand in devcontainer.json to Install Dependencies

[CFIALeronB]

Problem:

When setting up a new development container, developers have to manually install the required Python dependencies from requirements.txt.

Solution:

By adding the postCreateCommand directive in our devcontainer.json configuration, we can automate the installation of these dependencies upon the creation of the container.

Proposed Changes:

• Update the image field in devcontainer.json to use the mcr.microsoft.com/devcontainers/python:3.11 image.
• Incorporate the postCreateCommand directive in devcontainer.json to execute pip3 install --user -r requirements.txt.

This will ensure a smoother and more automated setup for developers using our dev container.

[k-allagbe]

This is done.