Create/Update assets for version 1.12.2

assets/minecraft/blockstates/stone.json

@@ -0,0 +1,10 @@
+{
+    "variants": {
+        "normal": [
+            { "model": "stone" },
+            { "model": "stone_mirrored" },
+            { "model": "stone", "y": 180 },
+            { "model": "stone_mirrored", "y": 180 }
+        ]
+    }
+}