You can create a “Hello World” project directly through the CLI using swift package:

mkdir HelloWorld
cd HelloWorld
swift package init --type executable

This will produce several files:

Creating executable package: HelloWorld
Creating Package.swift
Creating .gitignore
Creating Sources/
Creating Sources/main.swift

The interesting content is in Sources/main.swift:

// The Swift Programming Language
// https://docs.swift.org/swift-book

print("Hello, world!")

Then, just swift run:

[5/5] Linking HelloWorld
Build complete! (0.60s)
Hello, world!