C02 API Basic Rust Implementation

DONE:

• Basic API implementation
• Client Format
• Two C02 request implementations.

TODO:

• Rate Limitation
• Support of future Electricity Maps commercial API

Example:

use rust_c02_signal;

async fn do_stuff() -> () {
    let c02client = rust_c02_signal::Client::new("API-KEY".to_string());

    // Get the latest data for a country code
    let resp = c02client.latest_cc("GB".to_string()).await;

    println!("{:?}", resp);

    // Get the latest data for a set of long/lat coords
    let resp = c02client.latest_gc(51.5074, 0.1278).await;

    println!("{:?}", resp);
}