added settings page to handle setting the BASE_DIR value.

comic/templates/comic/settings_page.html

@@ -0,0 +1,17 @@
+{% extends "base.html" %}
+
+{% block title %}CBreader - Settings{% endblock %}
+
+{% block content %}
+{% if error_message %}
+<div class="alert alert-danger" role="alert">{{ error_message }}</div>
+{% endif %}
+<form method="POST">
+    {% csrf_token %}
+    <div class="form-group">
+        <label for="base_directory">Base Directory</label>
+        <input type="text" class="form-control" id="base_directory" name="base_directory" placeholder="Base Directory" value="{{ base_dir.value }}">
+    </div>
+    <button type="submit" class="btn btn-default">Submit</button>
+</form>
+{% endblock %}