add client brief page

src/components/project/Header.vue

@@ -0,0 +1,12 @@
+<template>
+  <header class="flex | bg-white | rounded-2xl | p-8 mb-16">
+    <h1 class="font-serif | px-8">{{ title }}</h1>
+    <button class="btn | ml-auto">Demander un RDV</button>
+  </header>
+</template>
+
+<script setup>
+const { title } = defineProps({
+  title: String,
+});
+</script>