v0.3.0 - UI refactor

rush v0.3.0

In this release, all UI code is moved to the ui module while preserving original functionality. This allows main.rs to act as an "orchestrator" between ui and RushEngine.

What's Changed

• refactor: extract UI module by @ekourtakis in #24
• chore: fix testing section in README.md by @ekourtakis in #25

Full Changelog: v0.2.0...v0.3.0