created add author template, containing a form that allows a user to add a new author

lancedamalerio_reading/bookshelf/templates/bookshelf/add-author.html

+{% extends 'base.html' %}
+{% load static %}
+
+{% block title %} Add New Author {% endblock %}
+{% block content %}
+    {{ form.non_field_errors }}
+    {% for field in form %} 
+        {% if field.errors %}
+            <p>{{ field.label }} has the following errors:</p>
+            <ul>
+            {% for error in field.errors %}
+                <li>{{ error }}</li>
+            {% endfor %}
+            </ul>
+        {% endif %}
+    {% endfor %}
+
+    <form action="authors/add" method="post">
+    {% csrf_token %}
+    {{form.as_p}} 
+    <input type="submit" value="Add Author">
+    </form>
+{% endblock %}
+