add eMastiff Tuya door sensor (#139)

Author: Wil T

custom_components/battery_notes/data/library.json

@@ -1284,6 +1284,12 @@
             "model": "TS0202",
             "battery_type": "AAA",
             "battery_quantity": 2
+        },
+        {
+            "manufacturer": "_TZ3000_yxqnffam",
+            "model": "TS0203",
+            "battery_type": "AAA",
+            "battery_quantity": 2
         }
     ]
 }