Add some basic docs info about the News system

docs/news.md

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+# News and Moderation
+
+All of the code for news is [located here](https://github.com/cppalliance/temp-site/tree/develop/news) and the templates are [here](https://github.com/cppalliance/temp-site/tree/develop/templates/news) .
+
+The model structure is a bit more advanced than many aspects of the Boost
+website. All news items inherit from a base concrete class `Entry`. So a
+particular type of news, for example Links, has a physical database table
+named `news_link` that has a pointer type `ForeignKey` to the corresponding
+item in `news_entry`.
+
+This allows for fast/efficient listing of all News items in reverse chronological
+order, but also allows for different types of news to add fields specific to
+their type.  As of launch, only Polls take advantage of this feature but it
+there to allow for better flexability in the future.
+
+## Definition of Published
+
+An item is considered published and visible to all users, logged in and anonymous,
+if:
+
+- The published date is in the past
+- The item has been approved by a moderator
+
+## Moderation
+
+If a user is a moderator, when they create news the items are automatically
+approved. This is to avoid an annoying scenario where a moderator enters a new
+news item, then has to go to the Moderation List page to approve it.
+
+However, this does mean moderators can publish things easily which might
+for example include typos.
+
+### Who can moderate?
+
+Users can moderate if:
+
+- The user posses the `change_entry` permission to the News Entry model
+- The user is in a group which posses the `change_entry` permission to the News Entry model
+- The user is a Superuser