added new doc about adding users and members

doc/permissions/permissions.md

@@ -6,6 +6,9 @@ If a user is both in a project group and in the project itself, the highest perm
 
 If a user is a GitLab administrator they receive all permissions.
 
+To add or import a user or member, you can follow the [Project users and members
+documentation](workflow/add-user/add-user.md).
+
 ## Project
 
 | Action                                | Guest   | Reporter   | Developer   | Master   | Owner  |

doc/workflow/README.md

@@ -10,6 +10,7 @@
 - [Notification emails](notifications.md)
 - [Project Features](project_features.md)
 - [Project forking workflow](forking_workflow.md)
+- [Project users and members](add-user/add-user.md)
 - [Protected branches](protected_branches.md)
 - [Web Editor](web_editor.md)
 - ["Work In Progress" Merge Requests](wip_merge_requests.md)

doc/workflow/add-user/add-user.md

+# Project Users and Members
+
+You can add or import members to your projects. You can also give them different access
+levels.
+
+You should have 'master' or 'owner' permissions to add or import a new member to your 
+project.
+
+To add or import a new member, go to your project and click on "Members" on the left side
+of your screen:
+
+![Members](images/members.png)
+
+Select "Add members" or "Import members" on the right side of your screen:
+
+![Add or Import](images/add-members.png)
+
+If you are adding a member, select the user and the [permission level](doc/permissions/permissions.md) that you'd like to
+give the member:
+
+![Add or Import](images/new-member.png)
+
+If you are importing a member, follow the steps to select the project where you'd like to import the user from.
+
+![Add or Import](images/select-project.png)