chore: update the project structure and files.

.eslintrc.json

@@ -0,0 +1,46 @@
+{
+  "env": {
+    "browser": true,
+    "es6": true
+  },
+  "extends": [
+    "eslint:recommended",
+    "plugin:@typescript-eslint/eslint-recommended"
+  ],
+  "globals": {
+    "Atomics": "readonly",
+    "SharedArrayBuffer": "readonly"
+  },
+  "parser": "@typescript-eslint/parser",
+  "parserOptions": {
+    "ecmaVersion": 2018,
+    "sourceType": "module"
+  },
+  "plugins": [
+    "@typescript-eslint"
+  ],
+  "rules": {
+    "indent": [
+      "error",
+      2,
+      {
+        "SwitchCase": 1
+      }
+    ],
+    "linebreak-style": [
+      "error",
+      "unix"
+    ],
+    "quotes": [
+      "error",
+      "single"
+    ],
+    "no-var": "error",
+    "object-curly-spacing": [
+      "error",
+      "always"
+    ],
+    "eqeqeq": "error",
+    "no-unused-vars": "error"
+  }
+}