Add basic docs.

docs/privacy.rst

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+Privacy Levels
+==============
+
+Read the Docs supports 3 different privacy levels on 2 different objects;
+Public, Protected, Private on Projects and Versions.
+
++------------+------------+-----------+
+| Viewable   | Detail     | Listing   |
++============+============+===========+
+| Private    | No         | No        |
++------------+------------+-----------+
+| Protected  | Yes        | No        |
++------------+------------+-----------+
+| Public     | Yes        | No        |
++------------+------------+-----------+
+
+Public
+------
+
+This is the easiest and most obvious. It is also the default. It means that everything is available to be seen by everyone.
+
+Protected
+---------
+
+Protected means that your object won't show up in Listing Pages, but Detail pages still still work.
+For example, a Project that is Protected will not show on the homepage Recently Updated list,
+however, if you link directly to the project, you will get a 200 and the page will display.
+
+Protected Versions are similar, they won't show up in your version listings, but will be available once linked to.
+
+
+Private
+-------
+
+Private objects are available only to people who have permissions so see them.
+They will not display on any list view, and will 404 when you link them to others.