Crypto Fear and Greed API wrapper

fng-api-wrapper is a Rust API client for Crypto Fear & Greed Index.

The wrapper is incomplete and does not cover the entire API.
So far it only covers the endpoint https://api.alternative.me/fng/

Sample code

```rust use chrono::Datelike; use fngapiwrapper::client;

fn main() { let fng = client::fetchdailyfng(10).unwrap(); fng.data.iter().foreach(|dailyrecord| {

    let ts = &daily_record.timestamp;
    let (year, month, day) = (ts.year(), ts.month(), ts.day());

    println!(
        "{year}-{month:0>2}-{day:0>2}: {:>2} -> {:?}",
        daily_record.value, daily_record.value_classification
    );
});

} ```