feat: add Die and Dice structs with grab and and_grab methods

01.workspace/oxydice_lib/src/tst/dice_grab.rs

@@ -0,0 +1,23 @@
+#[cfg(test)]
+mod tests {
+    use crate::*;
+    #[test]
+    fn dice_grab_should_create_a_new_handful_of_dice() {
+        let dice_handful = Dice::grab(3, 6);
+        assert_eq!(dice_handful.handful.len(), 3);
+        for die in dice_handful.handful {
+            assert_eq!(die.sides, 6);
+        }
+    }
+    #[test]
+    fn test_dice_and_grab_should_add_more_dice_to_handful() {
+        let initial_dice = Dice::grab(2, 6);
+        let initial_count = initial_dice.handful.len();
+        let new_dice_handful = initial_dice.and_grab(2, 8);
+        assert_eq!(new_dice_handful.handful.len(), initial_count + 2);
+        // Check the sides of the newly added dice
+        for i in initial_count..new_dice_handful.handful.len() {
+            assert_eq!(new_dice_handful.handful[i].sides, 8);
+        }
+    }
+}

01.workspace/oxydice_lib/src/tst/mod.rs

@@ -0,0 +1,2 @@
+
+pub mod dice_grab;