Release 0.4

[jjotaum]

• Bump swift-tool-version to 5.5, package & project main structure clean up.
• Refactor chroma arguments to receive asset path and exported file path to make it work on a more standard and less risky way.
• Clean up on unit tests setup.
• Update swift-argument-parser version to 1.1.2.
• Update folder file creation method to throw an error instead of causing a fatal error.
• Update Chroma description on Readme file