Onboarding Documentation for SwiftFetch

Problem/Feature Description

The SwiftFetch team maintains a lightweight HTTP client library for Node.js. The library has been well-received by experienced developers, but the project is now trying to grow its community. The maintainers have noticed that many developers abandon the library shortly after discovering it because there is no documentation to help complete beginners make their first successful request.

The team wants documentation that takes a developer who has never used SwiftFetch before and walks them through to a successful first result. The maintainers are not interested in comprehensive coverage of every feature; they want something focused and action-oriented that gets a newcomer to a working result as quickly as possible.

Output Specification

Produce a single Markdown file named tutorial.md containing the complete documentation.

The document should be realistic enough that a developer could follow it. You may invent plausible API details for SwiftFetch (installation command, import syntax, method names, example URLs) — consistency is more important than real accuracy.