Add RTMO model for keypoint detection (#2)

* Add RTMO

examples/rtmo/README.md

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+## Quick Start
+
+```shell
+cargo run -r --example rtmo
+```
+
+## Or you can manully
+
+### 1. Donwload ONNX Model
+
+[rtmo-s-dyn model](https://github.com/jamjamjon/assets/releases/download/v0.0.1/rtmo-s-dyn.onnx)  
+[rtmo-m-dyn model](https://github.com/jamjamjon/assets/releases/download/v0.0.1/rtmo-m-dyn.onnx)  
+[rtmo-l-dyn model](https://github.com/jamjamjon/assets/releases/download/v0.0.1/rtmo-l-dyn.onnx)  
+[rtmo-s-dyn-f16 model](https://github.com/jamjamjon/assets/releases/download/v0.0.1/rtmo-s-dyn-f16.onnx)  
+[rtmo-m-dyn-f16 model](https://github.com/jamjamjon/assets/releases/download/v0.0.1/rtmo-m-dyn-f16.onnx)  
+[rtmo-l-dyn-f16 model](https://github.com/jamjamjon/assets/releases/download/v0.0.1/rtmo-l-dyn-f16.onnx)  
+
+
+
+### 2. Specify the ONNX model path in `main.rs`
+
+```Rust
+let options = Options::default()
+    .with_model("ONNX_MODEL")    // <= modify this
+```
+
+### 3. Then, run
+
+```bash
+cargo run -r --example rtmo
+```
+
+## Results
+
+![](./demo.jpg)

examples/rtmo/main.rs

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+use usls::{models::RTMO, Annotator, DataLoader, Options, COCO_SKELETON_17};
+
+fn main() -> Result<(), Box<dyn std::error::Error>> {
+    // build model
+    let options = Options::default()
+        .with_model("../rtmo-l-dyn-f16.onnx")
+        .with_i00((1, 2, 8).into())
+        .with_nk(17)
+        .with_confs(&[0.3])
+        .with_kconfs(&[0.5]);
+    let mut model = RTMO::new(&options)?;
+
+    // load image
+    let x = vec![DataLoader::try_read("./assets/bus.jpg")?];
+
+    // run
+    let y = model.run(&x)?;
+
+    // // annotate
+    let annotator = Annotator::default()
+        .with_saveout("RTMO")
+        .with_skeletons(&COCO_SKELETON_17);
+    annotator.annotate(&x, &y);
+
+    Ok(())
+}