Add weapon data

public/data/weapons/fenghuang-down.json

@@ -0,0 +1,21 @@
+{
+  "id": "fenghuang-down",
+  "name": "Fenghuang Down",
+  "atk": 298,
+  "crt": 13,
+  "rarity": 5,
+  "skills": [
+    {
+      "name": "Key of Sentience",
+      "description": "[SP: 10][CD: 25s] Unleash Fenghuang Down's power to immobilize enemies nearby for up to 8s (up to 3s against elite enemies or bosses). 1s after being attacked by wielder or her teammates, immobilized enemies recover and take 2,000% ATK of Fire DMG."
+    },
+    {
+      "name": "Blazing Plume",
+      "description": "Wielder deals 40.0% bonus Fire DMG. Against enemies affected by the weapon active, she deals 40.0% bonus Total DMG for 2s."
+    },
+    {
+      "name": "Key of Sentience",
+      "description": "In Co-op Raid stages, wielder deals 22.0% bonus Elemental DMG and 22.0% more against paralyzed, frozen, or ignited enemies."
+    }
+  ]
+}