:wrench: add spell checker

.vscode/extensions.json

@@ -18,6 +18,7 @@
     "dbaeumer.vscode-eslint",
     "esbenp.prettier-vscode",
     "editorconfig.editorconfig",
-    "gruntfuggly.todo-tree"
+    "gruntfuggly.todo-tree",
+    "streetsidesoftware.code-spell-checker"
   ]
 }