add shovel and digging, basic item interaction

Assets/Scripts/Shovel.cs

@@ -0,0 +1,21 @@
+using UnityEngine;
+
+public class Shovel : MonoBehaviour
+{
+    public Animator shovelAnimator;
+
+    public void Dig()
+    {
+        shovelAnimator.SetTrigger("Dig");
+    }
+
+    // this only works if this script is sitting on the object with the collider!!
+    private void OnTriggerEnter(Collider other)
+    {
+        Diggable diggable = other.GetComponent<Diggable>();
+        if (diggable != null)
+        {
+            diggable.Dig();
+        }
+    }
+}