added and formatted author_detail.html to templates

bookshelf/templates/bookshelf/author_detail.html

+{%  extends 'base.html' %}
+
+{% block title %}{{ authors.first_name }} {{ authors.last_name }}{% endblock %}
+{% block header %}{{ authors.first_name }} {{ authors.last_name }}{%  endblock %}
+{% block content %}
+    <p>{{ authors.age }}</p><br>
+    <p>{{ authors.nationality }}</p><br>
+    <p>{{ authors.bio }}</p><br>
+    <h2>Books by {{ authors.first_name }} {{ authors.last_name }} I love <3:</h2>
+    {% for books in authors.books.all %}
+        <a href="http://127.0.0.1:8000/books/{{ books.pk }}">{{ books.title }}</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>
+    &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
+    <a href="http://127.0.0.1:8000/authors/">Authors</a>
+{% endblock %}
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