chore: add VS Code settings for auto-formatting and ESLint

.vscode/settings.json

@@ -0,0 +1,7 @@
+{
+  "editor.formatOnSave": true,
+  "editor.codeActionsOnSave": {
+    "source.fixAll.eslint": "explicit"
+  },
+  "eslint.validate": ["javascript", "javascriptreact", "typescript", "typescriptreact"]
+}