Update workflow

[ColtMcG1]

This pull request introduces a new VS Code extension for generating responsive images and makes a minor workflow configuration update. The main focus is on adding the extension.js file, which provides an interactive command for resizing images to multiple sizes and inserting responsive <img> tags with srcset and sizes attributes. Additionally, workflow permissions are updated to support release automation.

Responsive Image Generator Extension:

• Implements a VS Code extension in extension.js that allows users to select image files, specify output directories, choose sizes, and automatically generate resized images for responsive web design. The extension also provides a snippet completion for inserting responsive <img> tags with appropriate srcset and sizes attributes.

Workflow Configuration:

• Adds contents: write permission to the GitHub Actions release workflow (.github/workflows/release.yml), enabling automated release processes to update repository contents.