Create application templates

[samber]

3 repositories:

• api
• worker
• cli

Services:

• repository
• third-party
• cmd
• some pkg: http client, logging...
• some business logic
• api

Use existing template:

• https://github.com/golang-standards/project-layout
• https://github.com/albertwidi/go-project-example
• https://awesome-go.com/project-layout/
• https://go.dev/doc/modules/layout