Add recipe: Open a URL in the default web browser

[faysalalli423-arch]

This issue proposes adding a recipe for opening a URL in the user's default web browser.

The reference to "antigravity" (likely inspired by Python's import antigravity) typically refers to the ability to easily open a web page from code. A practical Rust implementation for this common task uses the webbrowser crate.

Proposed Recipe: Open a URL in the default browser

![webbrowser-badge]

Opens a specific URL in the system's default web browser using the webbrowser::open function.

fn main() {
    let url = "https://www.rust-lang.org";

    if webbrowser::open(url).is_ok() {
        println!("Successfully opened {} in the default browser.", url);
    }
}