rdv: add the concernedGroup vuejs component in add a new rdv

src/Bundle/ChillCalendarBundle/Resources/public/vuejs/Calendar/App.vue

@@ -0,0 +1,14 @@
+<template>
+   <concerned-groups></concerned-groups>
+</template>
+
+<script>
+import ConcernedGroups from 'ChillActivityAssets/vuejs/Activity/components/ConcernedGroups.vue';
+
+export default {
+   name: "App",
+   components: {
+      ConcernedGroups,
+   }
+}
+</script>