Add complete multiplayer system with real-time gameplay, challenge system, and 50x50 board option

node_modules/debug/.eslintrc

@@ -0,0 +1,11 @@
+{
+  "env": {
+    "browser": true,
+    "node": true
+  },
+  "rules": {
+    "no-console": 0,
+    "no-empty": [1, { "allowEmptyCatch": true }]
+  },
+  "extends": "eslint:recommended"
+}