Major v3.0.1

Domain-Driven Design

What's Changed

• separate test by @quangdangfit in #35
• Redis cache by @quangdangfit in #36
• upgrade go version by @quangdangfit in #40
• setup codecov by @quangdangfit in #41
• add license by @quangdangfit in #42
• add Dockerfile by @quangdangfit in #43
• Ddd by @quangdangfit in #46
• update sonar props by @quangdangfit in #47
• update README.md by @quangdangfit in #48

Full Changelog: v2.0.2...v3.0.1