Add component to upload book cover images

front/src/AddBook.vue

@@ -2,6 +2,7 @@
   import { ref, reactive, computed } from 'vue'
   import { postBook, extractFormErrorFromField } from './api.js'
   import { useRouter } from 'vue-router'
+  import CoverUpload from './CoverUpload.vue'
 
   const router = useRouter();
 
@@ -28,6 +29,7 @@
         }
       })
   }
+
 </script>
 
 <template>
@@ -48,6 +50,7 @@
       </div>
       <p v-if="authorError" class="help is-danger">{{authorError}}</p>
     </div>
+    <CoverUpload name="cover"/>
     <div class="field">
       <div class="control">
         <button class="button is-link">{{$t('addbook.submit')}}</button>