correction affiche livre

my-library/src/api/books.js

@@ -10,4 +10,8 @@ export function registerBook(book) {
 
 export function getBookById(id) {
   return client.get(`/api/books/${id}`);
+}
+
+export function reserveBook(bookId, reservation) {
+  return client.post(`/api/books/${bookId}/reservations`, reservation);
 }