Create/Update assets for version 1.13

assets/minecraft/blockstates/beetroots.json

@@ -0,0 +1,8 @@
+{
+    "variants": {
+        "age=0": { "model": "block/beetroots_stage0" },
+        "age=1": { "model": "block/beetroots_stage1" },
+        "age=2": { "model": "block/beetroots_stage2" },
+        "age=3": { "model": "block/beetroots_stage3" }
+    }
+}