### Basic QR Code Detection and Decoding in Rust

Source: https://github.com/wanzenbug/rqrr/blob/master/README.md

Demonstrates the fundamental steps to open an image, prepare it for QR code detection, find QR code grids, and decode their content. Requires the 'image' and 'rqrr' crates.

```rust
use image;
use rqrr;

let img = image::open("tests/data/github.gif")?.into_luma8();
// Prepare for detection
let mut img = rqrr::PreparedImage::prepare(img);
// Search for grids, without decoding
let grids = img.detect_grids();
assert_eq!(grids.len(), 1);
// Decode the grid
let (meta, content) = grids[0].decode()?;
assert_eq!(meta.ecc_level, 0);
assert_eq!(content, "https://github.com/WanzenBug/rqrr");
```

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