Add documentation for Design Management feature

https://gitlab.com/gitlab-org/gitlab-ce/issues/64243

doc/user/permissions.md

@@ -47,6 +47,7 @@ The following table depicts the various user permission levels in a project.
 | View approved/blacklisted licenses **(ULTIMATE)** | ✓       | ✓          | ✓           | ✓        | ✓      |
 | View license management reports **(ULTIMATE)**    | ✓ (*1*) | ✓          | ✓           | ✓        | ✓      |
 | View Security reports **(ULTIMATE)**              | ✓ (*1*) | ✓          | ✓           | ✓        | ✓      |
+| View [Design Management](project/issues/design_management.md) pages **(PREMIUM)** | ✓ (*1*) | ✓          | ✓           | ✓        | ✓      |
 | View project code                                 | ✓ (*1*) | ✓          | ✓           | ✓        | ✓      |
 | Pull project code                                 | ✓ (*1*) | ✓          | ✓           | ✓        | ✓      |
 | View GitLab Pages protected by [access control](project/pages/introduction.md#gitlab-pages-access-control-core-only) | ✓       | ✓          | ✓           | ✓        | ✓      |
@@ -74,6 +75,7 @@ The following table depicts the various user permission levels in a project.
 | View Error Tracking list                          |         | ✓          | ✓           | ✓        | ✓      |
 | Pull from [Maven repository](project/packages/maven_repository.md) or [NPM registry](project/packages/npm_registry.md) **(PREMIUM)** |         | ✓          | ✓           | ✓        | ✓      |
 | Publish to [Maven repository](project/packages/maven_repository.md) or [NPM registry](project/packages/npm_registry.md) **(PREMIUM)** |         |            | ✓           | ✓        | ✓      ||
+| Upload [Design Management](project/issues/design_management.md) files **(PREMIUM)** |         |            | ✓           | ✓        | ✓      |
 | Create new branches                               |         |            | ✓           | ✓        | ✓      |
 | Push to non-protected branches                    |         |            | ✓           | ✓        | ✓      |
 | Force push to non-protected branches              |         |            | ✓           | ✓        | ✓      |

doc/user/project/issues/design_management.md

+# Design Management **(PREMIUM)**
+
+> [Introduced](https://gitlab.com/groups/gitlab-org/-/epics/660) in [GitLab Premium](https://about.gitlab.com/pricing/) 12.2.
+
+CAUTION: **Warning:**
+This an __alpha__ feature and is subject to change at any time without
+prior notice.
+
+## Overview
+
+Design Management allows you to upload design assets (wireframes, mockups, etc.)
+to GitLab issues and keep them stored in one single place, accessed by the Design
+Management's page within an issue, giving product designers, product managers, and engineers a
+way to collaborate on designs over one single source of truth.
+
+You can easily share mock-ups of designs with your team, or visual regressions can be easily
+viewed and addressed.
+
+<i class="fa fa-youtube-play youtube" aria-hidden="true"></i>
+For an overview, see the video [Design Management (GitLab 12.2)](https://www.youtube.com/watch?v=CCMtCqdK_aM).
+
+## Requirements
+
+Design Management requires
+[Large File Storage (LFS)](../../../workflow/lfs/manage_large_binaries_with_git_lfs.md)
+to be enabled:
+
+- For GitLab.com, LFS is already enabled.
+- For self-managed instances, a GitLab administrator must have
+  [enabled LFS globally](../../../workflow/lfs/lfs_administration.md).
+- For both GitLab.com and self-managed instances: LFS must be enabled for the project itself.
+  If enabled globally, LFS will be enabled by default to all projects. To enable LFS on the
+  project level, navigate to your project's **Settings > General**, expand **Visibility, project features, permissions**
+  and enable **Git Large File Storage**.
+
+## Limitations
+
+- Files uploaded must have a file extension of either `png`, `jpg`, `jpeg`, `gif`, `bmp`, `tiff` or `ico`. The [`svg` extension is not yet supported](https://gitlab.com/gitlab-org/gitlab-ee/issues/12771).
+- [Designs cannot yet be deleted](https://gitlab.com/gitlab-org/gitlab-ee/issues/11089).
+- Design Management is [not yet supported in the project export](https://gitlab.com/gitlab-org/gitlab-ee/issues/11090).
+
+## The Design Management page
+
+Navigate to the **Design Management** page from any issue by clicking the **Designs** tab:
+
+![Designs tab](img/design_management_v12_2.png)
+
+## Adding designs
+
+To upload design images, click the **Upload Designs** button and select images to upload.
+
+Designs with the same filename as an existing uploaded design will create a new version
+of the design, and will replace the previous version.
+
+## Viewing designs
+
+Images on the Design Management page can be enlarged by clicking on them.
+

doc/user/project/issues/index.md

@@ -119,6 +119,12 @@ associated label or assignee will change to match that of the new column. The en
 board can also be filtered to only include issues from a certain milestone or an overarching
 label.
 
+### Design Management **(PREMIUM)**
+
+With [Design Management](design_management.md), you can upload design
+assets to issues and view them all together to easily share and
+collaborate with your team.
+
 ### Epics **(ULTIMATE)**
 
 [Epics](../../group/epics/index.md) let you manage your portfolio of projects more