Add first version of code, docs and tests

[gabmontes]

This PR adds the first version of everything in the repo. See the docs for more info. Not copying-pasting here!

[Copilot]

Pull Request Overview

This PR introduces the initial version of the project, including the code, documentation, tests, and configuration files necessary for sorting GitHub Actions YAML files.

• Adds various YAML fixture files for workflows and composite actions (both unsorted and sorted).
• Implements the core sorting functionality in JavaScript (src/index.js) based on a configuration defined in keys.json.
• Provides comprehensive configuration and CI/CD setup across multiple files (e.g. package.json, GitHub workflows, ESLint, Husky).

Reviewed Changes

Copilot reviewed 24 out of 24 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
test/fixtures/workflow.yml	Unsorted workflow file fixture
test/fixtures/workflow-sorted.yml	Sorted workflow file fixture
test/fixtures/other.yml	A YAML file with an unusual structure that may not be valid
test/fixtures/action.yml	Unsorted composite action file with key order differing from guide
test/fixtures/action-sorted.yml	Sorted composite action file fixture
src/keys.json	Configuration for sorting rules
src/index.js	Sorting algorithm implementation using the YAML package
package.json	Project metadata and dependency configuration
README.md	Documentation on project purpose and usage
Other configuration files	Supporting CI/CD and dev tooling settings

Comments suppressed due to low confidence (1)

test/fixtures/other.yml:3

• The structure in this file does not conform to a valid GitHub Actions workflow format. Please verify if this file is intended as an invalid fixture or update it to follow proper YAML structure.

- github: