Add weapon data

public/data/weapons/pledge-of-rain.json

@@ -0,0 +1,17 @@
+{
+  "id": "pledge-of-rain",
+  "name": "Pledge of Rain",
+  "atk": 287,
+  "crt": 29,
+  "rarity": 5,
+  "skills": [
+    {
+      "name": "Love is War!",
+      "description": "[SP: 16][CD: 18s] Throw an open umbrella forward to scatter ice crystals in all directions, dealing 24*30.0% ATK of Ice DMG to enemies  in a large AOE and slowing their Attack and Move Speeds by 40% for 5.00s."
+    },
+    {
+      "name": "Our Pact",
+      "description": "Attacks gain 20.0% Physical DMG against slowed enemies. When Combo Hit Count exceeds 50, gain 20.0% Total DMG Multiplier."
+    }
+  ]
+}