chore: add prettier to workspace extensions

.vscode/extensions.json

@@ -3,6 +3,7 @@
     "streetsidesoftware.code-spell-checker",
     "streetsidesoftware.code-spell-checker-french",
     "angular.ng-template",
-    "devescalus.svg-sprites-viewer"
+    "devescalus.svg-sprites-viewer",
+    "esbenp.prettier-vscode"
   ]
 }