added primary ability and new AC and speed calculations

dungeonsheets/magic_items.py

@@ -0,0 +1,20 @@
+class MagicItem():
+    """
+    Generic Magic Item. Add description here.
+
+    """
+    name = ''
+    ac_bonus = 0
+    requires_attunement = False
+    rarity = ''
+
+
+class RingOfProtection(MagicItem):
+    """
+    You gain a +1 bonus to AC and Saving Throws while wearing this ring.
+
+    """
+    name = "Ring of Protection"
+    ac_bonus = 1
+    requires_attunement = True
+    rarity = 'Rare'