Added eslint and prettier configs.

.eslintrc.json

@@ -0,0 +1,20 @@
+{
+  "env": {
+    "es2021": true,
+    "node": true
+  },
+  "extends": [
+    "eslint:recommended",
+    "plugin:prettier/recommended"
+  ],
+  "parserOptions": {
+    "ecmaVersion": 12,
+    "sourceType": "module"
+  },
+  "plugins": [
+    "prettier"
+  ],
+  "rules": {
+    "prettier/prettier": "error"
+  }
+} 

.prettierrc.json

@@ -0,0 +1,8 @@
+{
+  "semi": true,
+  "singleQuote": true,
+  "trailingComma": "es5",
+  "printWidth": 100,
+  "tabWidth": 2,
+  "endOfLine": "lf"
+} 

.vscode/settings.json

@@ -0,0 +1,5 @@
+{
+  "eslint.options": {
+    "overrideConfigFile": "./.eslintrc.json"
+  }
+}