Add recipe for crafting police handcuff

src/main/resources/data/szar/recipes/police_handcuff.json

@@ -0,0 +1,15 @@
+{
+    "type": "minecraft:crafting_shaped",
+    "pattern": [
+        "###",
+        "i i"
+    ],
+    "key": {
+        "#": "minecraft:iron_nugget",
+        "i": "minecraft:iron_ingot"
+    },
+    "result": {
+        "id": "szar:police_handcuff",
+        "count": 1
+    }
+}