Create basic architecture for OUDS Swift Package (#46)

[pylapp]

Note: Please transform - [ ] into - (NA) in the description when things are not applicable

Related issues

46

Description

• Add Swift Package in repository
• Rename demo app to showcase

Motivation & Context

• Need to have basic architecture with SPM for project before moving SwiftFormat and SwiftLint from CocoaPods to SPM so as to complete CI/CD chain implementation
• Need to have clear naming

Types of change

• Breaking change (fix or feature that would change existing functionality)

Previews

Checklist

Contribution

• [x] I have read the contributing guidelines

Accessibility

• [x] My change follows accessibility good practices

Design

• [x] My change respects the design guidelines of Orange Unified Design System

Development

• [x] My change follows the developer guide
• [ ] I have added unit tests to cover my changes (optional)

Documentation

• [x] My change introduces changes to the documentation and/or I have updated the documentation accordingly

Checklist (for Core Team only)

• [x] The evolution have been tested and the project builds for iPhones and iPads
• [x] Code review has been done by reviewers according to CODEOWNERS file
• [x] Design review has been done
• [x] Accessibiltiy review has been done
• [x] Q/A team has tested the evolution
• [x] Documentation has been updated if relevant
• [x] Internal files have been updated if relevant (like CONTRIBUTING, DEVELOP, THIRD_PARTY, CONTRIBUTORS, NOTICE)
• [x] CHANGELOG has been updated respecting keep a changelog rules and reference the issues