add beginnings of admin panel

templates/admin/signed_out.html

@@ -0,0 +1,18 @@
+{% extends "base.html" %}
+
+{% block body %}
+  <div id="admin_signin" class="section">
+    <h3 class="section_heading">Sign In</h3>
+    {% if incorrect_password %}
+    <h4>Incorrect Password</h4>
+    {% endif %}
+    <form id="admin_signin_form" action="admin" method="post">
+      <div>
+        <label>
+          <input type="password" id="admin_password" name="password" placeholder="Admin password"/>
+        </label>
+      </div>
+      <input id="admin_signin_button" type="submit" value="Sign In"/>
+    </form>
+  </div>
+{% endblock %}