New help file about cookies for login page

diff --git a/lang/en/help/cookies.html b/lang/en/help/cookies.html
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+<p align="center"><b>Cookies</b></p>
+
+<p>Two cookies are used by this site.</p>
+
+<p>The essential one is the session cookie, usually called <b>MoodleSession</b>.  You must allow this cookie 
+   into your browser to provide continuity and maintain your login from page to page. When you log out or 
+   close the browser this cookie is destroyed (in your browser and on the server).</p>
+
+<p>The other cookie is purely for convenience, usually called something like <b>MOODLEID</b>.  It just remembers 
+   your username within the browser. This means when you return to this site the username field on the 
+   login page will be already filled out for you. It is safe to refuse this cookie - you will just have 
+   to retype your username every time you log in.</p>
+