added link to "importing to GitLab". Also organized docs in alphabetical order.

doc/README.md

-# Documentation
-
-## User documentation
-
-- [API](api/README.md) Automate GitLab via a simple and powerful API.
-- [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.
-- [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.
-- [Web hooks](web_hooks/web_hooks.md) Let GitLab notify you when new code has been pushed to your project.
-- [Workflow](workflow/README.md) Using GitLab functionality and importing projects from GitHub and SVN.
-- [GitLab as OAuth2 authentication service provider](integration/oauth_provider.md). It allows you to login to other applications from GitLab.
-
-## Administrator documentation
-
-- [Install](install/README.md) Requirements, directory structures and installation from source.
-- [Integration](integration/README.md) How to integrate with systems such as JIRA, Redmine, LDAP and Twitter.
-- [Raketasks](raketasks/README.md) Backups, maintenance, automatic web hook setup and the importing of projects.
-- [Custom git hooks](hooks/custom_hooks.md) Custom git hooks (on the filesystem) for when web hooks aren't enough.
-- [System hooks](system_hooks/system_hooks.md) Notifications when users, projects and keys are changed.
-- [Security](security/README.md) Learn what you can do to further secure your GitLab instance.
-- [Update](update/README.md) Update guides to upgrade your installation.
-- [Welcome message](customization/welcome_message.md) Add a custom welcome message to the sign-in page.
-- [Issue closing](customization/issue_closing.md) Customize how to close an issue from commit messages.
-- [Libravatar](customization/libravatar.md) Use Libravatar for user avatars.
-- [Operations](operations/README.md) Keeping GitLab up and running
-- [Log system](logs/logs.md) Log system
-
-## Contributor documentation
-
-- [Development](development/README.md) Explains the architecture and the guidelines for shell commands.
-- [Legal](legal/README.md) Contributor license agreements.
-- [Release](release/README.md) How to make the monthly and security releases.
+# Documentation
+
+## User documentation
+
+- [API](api/README.md) Automate GitLab via a simple and powerful API.
+- [GitLab as OAuth2 authentication service provider](integration/oauth_provider.md). It allows you to login to other applications from GitLab.
+- [Importing to GitLab](doc/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.
+- [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.
+- [Web hooks](web_hooks/web_hooks.md) Let GitLab notify you when new code has been pushed to your project.
+- [Workflow](workflow/README.md) Using GitLab functionality and importing projects from GitHub and SVN.
+
+## Administrator documentation
+
+- [Custom git hooks](hooks/custom_hooks.md) Custom git hooks (on the filesystem) for when web hooks aren't enough.
+- [Install](install/README.md) Requirements, directory structures and installation from source.
+- [Integration](integration/README.md) How to integrate with systems such as JIRA, Redmine, LDAP and Twitter.
+- [Issue closing](customization/issue_closing.md) Customize how to close an issue from commit messages.
+- [Libravatar](customization/libravatar.md) Use Libravatar for user avatars.
+- [Log system](logs/logs.md) Log system.
+- [Operations](operations/README.md) Keeping GitLab up and running
+- [Raketasks](raketasks/README.md) Backups, maintenance, automatic web hook setup and the importing of projects.
+- [Security](security/README.md) Learn what you can do to further secure your GitLab instance.
+- [System hooks](system_hooks/system_hooks.md) Notifications when users, projects and keys are changed.
+- [Update](update/README.md) Update guides to upgrade your installation.
+- [Welcome message](customization/welcome_message.md) Add a custom welcome message to the sign-in page.
+
+## Contributor documentation
+
+- [Development](development/README.md) Explains the architecture and the guidelines for shell commands.
+- [Legal](legal/README.md) Contributor license agreements.
+- [Release](release/README.md) How to make the monthly and security releases.
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