Added main template page

Author: abeverley

templates/main.html

@@ -0,0 +1,13 @@
+[% INCLUDE header.html %]
+
+<h1>Welcome to ADBOS</h1>
+<div style="width:600px">
+<p>[% intro %]</p>
+<p>A limited set of OPDEF data can be viewed without an account, but to view
+full details you must <a href="/register">register for an account</a>.</p>
+
+<p>Forgotten your password? <a href="/emailpw">Reset your password</a></p>
+
+</div>
+
+[% INCLUDE footer.html %]