Added rules to policy page on website

See http://openrails.org/contribute/team-policies/

Author: Chris Jakeman

Website/openrails.org/contribute/team-policies/index.php

@@ -47,6 +47,18 @@
 <p>
 English documents and text use American spelling (license, color etc.).
 </p>
+
+<h2>Keyboard Assignments</h2>
+<p>
+New key assignments should obey the following rules where that is possible.
+<ul>
+  <li>Reserve digit keys for camera operations.</li>
+  <li>Reserve Fn keys for pop-up windows.</li>
+  <li>Reserve the Alt modifier for debug operations.</li>
+  <li>Reserve modifier+space (e.g. Ctrl+space) for future expansion using sequences of keys.</li>
+</ul>
+Existing key assignments may not be changed without community discussion and approval of the Open Rails Management Team.
+</p>
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