Merge pull request #3 from Imaging-Plaza/dev

[caviri]

Hi @qchapp, I included some utilities to facilitate the development of the tool.

• Devcontainer: helps when coding with vscode. Have you ever used these? They are pretty cool.
• Justfile: These are an easy way to trigger common actions.
• Github Actions: Automates the generation of images for easy deployment.
• Changelog.md

I also renamed the master branch to main, and created a develop branch as we agreed.