Add weapon data

public/data/weapons/muramasa-bloodlust.json

@@ -0,0 +1,13 @@
+{
+  "id": "muramasa-bloodlust",
+  "name": "Muramasa Bloodlust",
+  "atk": 128,
+  "crt": 2,
+  "rarity": 3,
+  "skills": [
+    {
+      "name": "Ripper Blade",
+      "description": "[SP: 3][CD: 4s] Launches an ethereal blade, dealing 50% ATK of Physical DMG and bleeding the enemy to deal another 62 Physical DMG every 0.5s for 3s. Stores 3 charges."
+    }
+  ]
+}