Get basic incomplete Python queue API working

src/lib.rs

@@ -1,16 +1,12 @@
 pub mod backing;
+pub mod queue;
 
 use pyo3::prelude::*;
+use queue::pure::PureQueue;
 
-/// Formats the sum of two numbers as string.
-#[pyfunction]
-fn sum_as_string(a: usize, b: usize) -> PyResult<String> {
-    Ok((a + b).to_string())
-}
-
-/// A Python module implemented in Rust.
+/// Bindings for the Rust queue implementations
 #[pymodule]
 fn pyority_queue(m: &Bound<'_, PyModule>) -> PyResult<()> {
-    m.add_function(wrap_pyfunction!(sum_as_string, m)?)?;
+    m.add_class::<PureQueue>()?;
     Ok(())
 }