Create MVP for release

[kinnell]

Description

This PR serves to create the MVP for release.

[Copilot]

Pull Request Overview

This PR creates the initial MVP release (v0.0.1) of the EnumFields gem, which provides enhanced enum-like functionality for ActiveRecord models with support for metadata properties such as labels, icons, colors, and tooltips.

Key Changes

• Core enum field functionality with hash and array definition formats
• Automatic generation of class methods, instance methods, scopes, validations, and inquiry methods
• Custom column mapping support to separate accessor names from database column names

Reviewed Changes

Copilot reviewed 21 out of 22 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
lib/enum_fields.rb	Main module with concern integration and public API for defining enum fields
lib/enum_fields/definition.rb	Definition class handling validation and normalization of enum definitions
lib/enum_fields/enum_field.rb	Core EnumField class that generates all methods, scopes, and validations
lib/enum_fields/errors.rb	Custom error classes for missing and invalid definitions
spec/support/mock_active_record.rb	Mock ActiveRecord base class for testing without database
spec/support/shared_contexts.rb	Shared RSpec contexts for test model setup
spec/support/test_model_helper.rb	Helper module for creating test models dynamically
spec/spec_helper.rb	RSpec configuration with Pathname requirement
spec/enum_fields/*.spec.rb	Comprehensive test coverage for hash definitions, array definitions, column overrides, error handling, additional properties, and version
enum_fields.gemspec	Gem specification with dependencies on ActiveRecord/ActiveSupport 6.0-9.0 and Ruby >= 2.7.6
Gemfile	Development dependencies including RSpec 3.13 and Rubocop 1.70
README.md	Comprehensive documentation with usage examples and API reference
CHANGELOG.md	Initial release changelog for v0.0.1
.rubocop.yml	Rubocop configuration targeting Ruby 2.7
.rspec	RSpec configuration with Fuubar formatter

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