add new help files

lang/zh_cn/help/reading.html

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+<P ALIGN=CENTER><B>Reading</B></P>
+
+<P>When reading texts quickly it is often very easy to misunderstand what the 
+   author was trying to say.</P>
+
+<P>To avoid misunderstanding, read texts carefully and try to see the words
+   from the author's point of view.  Be empathic.</P>
+
+<P>It can also help to think of what the author has NOT said - this may 
+   help you form questions in your own mind.</P>
+
+<P ALIGN=RIGHT><? helpbutton("questions", get_string("helpquestions"), "moodle", true, true) ?></P>
+<P ALIGN=RIGHT><? helpbutton("writing", get_string("helpwriting"), "moodle", true, true) ?></P>

lang/zh_cn/help/writing.html

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+<P ALIGN=CENTER><B>Writing</B></P>
+
+(this is a draft help file, please do not translate yet)
+
+<P>When writing text for others to read, keep your audience in mind.</P>
+
+<P>Explain your ideas as clearly as you can to help avoid misunderstandings. 
+   In the forums you can achieve this by keeping your posts short and on-topic, 
+   instead of one long rambling post that makes many points, it is usually 
+   better to write several shorter ones (perhaps in separate forums).</P>
+
+<P>Re-edit your text as much as necessary until you get it right.   
+   Even in forum posts you have <?PHP echo ($CFG->maxeditingtime/60) ?> minutes 
+   after you've posted it to go back and improve it if necessary.</P>
+
+<P>When replying to others, try and think of interesting questions you 
+   can ask them.  This will help both you and them think about the 
+   issue at hand.</P>
+
+
+<P ALIGN=RIGHT><? helpbutton("questions", get_string("helpquestions"), "moodle", true, true) ?></P>
+<P ALIGN=RIGHT><? helpbutton("reading", get_string("helpreading"), "moodle", true, true) ?></P>