feat: implement roll for Die

01.workspace/oxidice_lib/src/imp/die_roll.rs

@@ -0,0 +1,8 @@
+use crate::*;
+
+impl Die {
+    pub fn roll(&self) -> u16 {
+        let mut rng = rand::rng();
+        rng.random_range(1..=self.sides)
+    }
+}