Add docs for Profile > Preferences

Also converts doc/README.md to Unix line endings

doc/README.md

@@ -7,6 +7,7 @@
 - [Importing to GitLab](workflow/importing/README.md).
 - [Markdown](markdown/markdown.md) GitLab's advanced formatting system.
 - [Permissions](permissions/permissions.md) Learn what each role in a project (guest/reporter/developer/master/owner) can do.
+- [Profile Settings](profile/profile.md)
 - [Project Services](project_services/project_services.md) Integrate a project with external services, such as CI and chat.
 - [Public access](public_access/public_access.md) Learn how you can allow public and internal access to projects.
 - [SSH](ssh/README.md) Setup your ssh keys and deploy keys for secure access to your projects.

doc/profile/preferences.md

+# Profile Preferences
+
+Settings in the **Profile > Preferences** page allow the user to customize
+various aspects of the site to their liking.
+
+## Application theme
+
+Changing this settings allows the user to customize the color scheme used for
+the navigation bar on the left side of the screen.
+
+The default is **Charcoal**.
+
+## Syntax highlighting theme
+
+Changing this setting allows the user to customize the theme used when viewing
+syntax highlighted code on the site.
+
+The default is **White**.
+
+## Behavior
+
+### Default Dashboard
+
+For users who have access to a large number of projects but only keep up with a
+select few, the amount of activity on the default Dashboard page can be
+overwhelming.
+
+Changing this setting to allows the user to redefine what their default
+dashboard will be. Setting it to **Starred Projects** will make that Dashboard
+view the default when signing in or clicking the application logo in the upper
+left.
+
+The default is **Projects**.

doc/profile/profile.md

+# Profile Settings
+
+- [Preferences](preferences.md)