Setup Rust crate for ServiceStack HTTP client library

[Copilot]

Initialize production-ready Rust library for publishing ServiceStack HTTP client to crates.io.

Core Implementation

• ServiceStackClient: Async HTTP client with GET/POST/PUT/DELETE/PATCH methods
• Type-safe JSON: Request/response handling via serde serialization
• Error handling: Custom error types wrapping reqwest and serde_json errors
• Helper methods: Extracted build_url() and send_json() to reduce duplication across HTTP methods

Package Configuration

• Cargo.toml configured with required crates.io metadata (license, keywords, categories, repository links)
• Dependencies: reqwest 0.12, serde 1.0, tokio 1.0, thiserror 1.0
• BSD-3-Clause license

Usage Example

use servicestack::{ServiceStackClient, Result};
use serde::{Deserialize, Serialize};

#[derive(Serialize)]
struct HelloRequest { name: String }

#[derive(Deserialize)]
struct HelloResponse { result: String }

#[tokio::main]
async fn main() -> Result<()> {
    let client = ServiceStackClient::new("https://api.example.com");
    let response: HelloResponse = client.post("/hello", &HelloRequest {
        name: "World".to_string()
    }).await?;
    Ok(())
}

Documentation

• Comprehensive API docs with examples
• README with installation and usage guides
• PUBLISHING.md with crates.io deployment instructions

Ready for cargo publish after configuring crates.io token.

Original prompt

Setup Rust project to publish ServiceStack HTTP Client Library to Rust crates.io

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