Added two links for adding book and author

diannedelpilar_reading/bookshelf/templates/bookshelf/home.html

@@ -20,6 +20,12 @@
     <div class="flex-parent jc-center">
         <button onclick="location.href = 'books/'" class="blue margin-right">Books</button>
         <button onclick="location.href = 'authors/'" class="pink">Authors</button>
+        <br><br>
+    </div>
+
+    <div>
+        <button onclick="location.href = 'books/add'">Add Book</button>
+        <button onclick="location.href = 'authors/add'">Add Author</button>
     </div>
 </body>