Add weapon data

public/data/weapons/hrungnir.json

@@ -0,0 +1,17 @@
+{
+  "id": "hrungnir",
+  "name": "Hrungnir",
+  "atk": 278,
+  "crt": 27,
+  "rarity": 5,
+  "skills": [
+    {
+      "name": "Rime Fury",
+      "description": "[SP: 12][CD: 20s] Leaps into the air and lands on the target, dealing 700% ATK of Ice DMG to enemies near the target. After landing, character gains 30% Attack Speed for 10s."
+    },
+    {
+      "name": "Shattered Whet",
+      "description": "Character gains 25% Total DMG Multiplier. Attacks against enemies who are frozen or with slowed Move Speed or Attack Speed has 25% chance of dealing 150% ATK of bonus Physical DMG. There is a minimum 1s interval between triggering the bonus DMG on the targets."
+    }
+  ]
+}