Add docs for confidential issues

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diff --git a/doc/user/project/issues/confidential_issues.md b/doc/user/project/issues/confidential_issues.md
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+# Confidential issues
+
+> Introduced in GitLab 8.6.
+
+Confidential issues are issues visible only to members of a project with
+[sufficient permissions](#permissions-and-access-to-confidential-issues).
+Confidential issues can be used by open source projects and companies alike to
+keep security vulnerabilities private or prevent surprises from leaking out.
+
+## Making an issue confidential
+
+You can make an issue confidential either by creating a new issue or editing
+an existing one.
+
+When you create a new issue, a checkbox right below the text area is available
+to mark the issue as confidential. Check that box and hit the **Submit issue**
+button to create the issue. For existing issues, edit them, check the
+confidential checkbox and hit **Save changes**.
+
+![Creating a new confidential issue](img/confidential_issues_create.png)
+
+## Making an issue non-confidential
+
+To make an issue non-confidential, all you have to do is edit it and unmark
+the confidential checkbox. Once you save the issue, it will gain the default
+visibility level you have chosen for your project.
+
+Every change from regular to confidential and vice versa, is indicated by a
+system note in the issue's comments.
+
+![Confidential issues system notes](img/confidential_issues_system_notes.png)
+
+## Indications of a confidential issue
+
+>**Note:** If you don't have [enough permissions](#permissions-and-access-to-confidential-issues),
+you won't be able to see the confidential issues at all.
+
+There are a few things that visually separate a confidential issue from a
+regular one. In the issues index page view, you can see the eye-slash icon
+next to the issues that are marked as confidential.
+
+![Confidential issues index page](img/confidential_issues_index_page.png)
+
+---
+
+Likewise, while inside the issue, you can see the eye-slash icon right next to
+the issue number, but there is also an indicator in the comment area that the
+issue you are commenting on is confidential.
+
+![Confidential issue page](img/confidential_issues_issue_page.png)
+
+## Permissions and access to confidential issues
+
+There are two kinds of level access for confidential issues. The general rule
+is that confidential issues are visible only to members of a project with at
+least [Reporter access][permissions]. However, a guest user can also create
+confidential issues, but can only view the ones that they created themselves.
+
+Confidential issues are also hidden in search results for unprivileged users.
+For example, here's what a user with Master and Guest access sees in the
+project's search results respectively.
+
+| Master access | Guest access |
+| :-----------: | :----------: |
+| ![Confidential issues search master](img/confidential_issues_search_master.png) | ![Confidential issues search guest](img/confidential_issues_search_guest.png) |
+
+[permissions]: ../../permissions.md#project
diff --git a/doc/user/project/issues/img/confidential_issues_create.png b/doc/user/project/issues/img/confidential_issues_create.png
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diff --git a/doc/user/project/issues/img/confidential_issues_index_page.png b/doc/user/project/issues/img/confidential_issues_index_page.png
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diff --git a/doc/user/project/issues/img/confidential_issues_search_guest.png b/doc/user/project/issues/img/confidential_issues_search_guest.png
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diff --git a/doc/user/project/issues/img/confidential_issues_search_master.png b/doc/user/project/issues/img/confidential_issues_search_master.png
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diff --git a/doc/user/project/issues/img/confidential_issues_system_notes.png b/doc/user/project/issues/img/confidential_issues_system_notes.png
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