Add weapon data

public/data/weapons/cross.json

@@ -0,0 +1,13 @@
+{
+  "id": "cross",
+  "name": "Cross",
+  "atk": 76,
+  "crt": 8,
+  "rarity": 2,
+  "skills": [
+    {
+      "name": "Silver Bullets",
+      "description": "[SP: 10][CD: 13s] Deploys the weapon, firing a silver bullet at a random enemy within range every 0.8s for the next 8s. The silver bullets explode, dealing 400 Physical DMG to enemies in a small AOE."
+    }
+  ]
+}