add href links to home.html for book and author create views

bookshelf/templates/bookshelf/home.html

@@ -8,4 +8,8 @@
     <a href="/books/">Books</a>
     &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
     <a href="/authors/">Authors</a>
+    <br>
+    <a href="/books/add/">Add Book</a>
+    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+    <a href="/authors/add/">Add Author</a>
 {% endblock %}
\ No newline at end of file