A first VueJS component, get api datas, a simple button add person

* !! composer require serializer !!
* see: http://localhost:8001/fr/parcours/861/show

composer.json

@@ -52,7 +52,8 @@
         "symfony/browser-kit": "^5.2",
         "symfony/css-selector": "^5.2",
         "twig/markdown-extra": "^3.3",
-        "erusev/parsedown": "^1.7"
+        "erusev/parsedown": "^1.7",
+        "symfony/serializer": "^5.2"
     },
     "conflict": {
         "symfony/symfony": "*"