Create devcontainer.json

[starlightretailceo]

This pull request includes the addition of a new configuration file for the development container. The most important change is the inclusion of a .devcontainer/devcontainer.json file to specify the container image and features.

Development container configuration:

• .devcontainer/devcontainer.json: Added configuration file specifying the use of the mcr.microsoft.com/devcontainers/universal:2 image.<!-