Merge branch 'improve_doc' into 'master'

Gitlab.com importer: Doc && screenshots

See merge request !1520

doc/integration/omniauth.md

@@ -76,6 +76,7 @@ Before configuring individual OmniAuth providers there are a few global settings
 ## Supported Providers
 
 - [GitHub](github.md)
+- [GitLab](gitlab.md)
 - [Google](google.md)
 - [Shibboleth](shibboleth.md)
 - [Twitter](twitter.md)

doc/workflow/README.md

@@ -9,5 +9,6 @@
 - [Notifications](notifications.md)
 - [Migrating from SVN to GitLab](migrating_from_svn.md)
 - [Project importing from GitHub to GitLab](import_projects_from_github.md)
+- [Project importing from GitLab.com to your private GitLab instance](import_projects_from_gitlab_com.md)
 - [Protected branches](protected_branches.md)
 - [Web Editor](web_editor.md)

doc/workflow/import_projects_from_gitlab_com.md

+# Project importing from GitLab.com to your private GitLab instance
+
+You can import your existing GitLab.com projects to your GitLab instance. But keep in mind that it is possible only if
+GitLab support is enabled on your GitLab instance. 
+You can read more about Gitlab support [here](http://doc.gitlab.com/ce/integration/gitlab.html)
+To get to the importer page you need to go to "New project" page.
+
+![New project page](gitlab_importer/new_project_page.png)
+
+Click on the "Import projects from Gitlab.com" link and you will be redirected to GitLab.com 
+for permission to access your projects. After accepting, you'll be automatically redirected to the importer.
+
+
+![Importer page](gitlab_importer/importer.png)
+
+
+To import a project, you can simple click "Import". The importer will import your repository and issues. 
+Once the importer is done, a new GitLab project will be created with your imported data.
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