added and formatted authors.html in templates

bookshelf/templates/bookshelf/authors.html

+{%  extends 'base.html' %}
+
+{% block title %}My Favorite Authors{% endblock %}
+{% block header %}RJ's Favorite Authors{%  endblock %}
+{% block content %}
+    {% for authors in authors %}
+        <a href="http://127.0.0.1:8000/books/{{ authors.pk }}">{{ authors.first_name }} {{ authors.last_name }}</a><br>
+    {% endfor %}
+    <br>
+    <a href="http://127.0.0.1:8000/homepage/">Home</a>
+    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+    <a href="http://127.0.0.1:8000/books/">Books</a>
+{% endblock %}
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