[Articles] Add WritingArticles.

Author: jverkoey

Articles/WritingArticles.mdown

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+
+How to Write a Three20 Article
+==============================
+
+* Use [Markdown](http://daringfireball.net/projects/markdown/).
+
+* Consider that your audience can be anywhere from fresh to seasoned veterans.
+
+* Get someone to read it over before you commit, even if that someone is you.
+
+* Structure your document in a logical order. Use headers wisely.
+
+* If you're discussing a technical feature, provide a Troubleshooting section in the form
+  of a Q&A (question and answer).
+
+* Sign any article you work on and denote the action you took. Use the following format:
+
+        This article written by:  
+        -- John Smith (@twitter) *<verb> on <Today's date>.*
+
+  Yes, git provides adequate versioning support, but signing the articles makes it easy
+  to see who's had their pen in an article at a glance.