fix: disable buggy import/extensions rule on demo

Author: Loïc Mangeonjean

demo/.eslintrc

@@ -0,0 +1,26 @@
+{
+  "env": {
+    "es6": true,
+    "browser": true
+  },
+  "parserOptions": {
+    "project": "./tsconfig.eslint.json"
+  },
+  "extends": [
+    "@codingame"
+  ],
+  "rules": {
+    "import/extensions": ["off"],
+    "@typescript-eslint/no-unused-vars": [
+      "warn",
+      { 
+        "argsIgnorePattern": "^_",
+        "varsIgnorePattern": "^_",
+        "caughtErrorsIgnorePattern": "^_"
+      }
+    ]
+  },
+  "ignorePatterns": [
+    "dist/**/*"
+  ]
+}