Add example of using parameters

rclrust/examples/parameters.rs

@@ -0,0 +1,22 @@
+use anyhow::Result;
+
+use rclrust::rclrust_info;
+use rclrust::{Parameter, ParameterValue};
+
+fn main() -> Result<()> {
+    let ctx = rclrust::init()?;
+    let node = ctx.create_node("example_parameters")?;
+    let logger = node.logger();
+
+    node.declare_parameter("param0", &ParameterValue::integer(20))?;
+
+    rclrust_info!(logger, "param0 = {}", node.get_parameter("param0").unwrap());
+
+    node.set_parameter(Parameter::double("param0", 2.3))?;
+
+    rclrust_info!(logger, "param0 = {}", node.get_parameter("param0").unwrap());
+
+    std::thread::sleep(std::time::Duration::from_secs(20));
+
+    Ok(())
+}

rclrust/src/parameter/mod.rs

@@ -24,7 +24,7 @@ impl fmt::Display for Parameter {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         write!(
             f,
-            r#"Parameter(name = "{}", value = {})"#,
+            r#"Parameter(name="{}", value={})"#,
             self.name, self.value
         )
     }