Merge branch 'label-doc' into 'master'

Label doc

Fixes #1487

See merge request !1028

doc/workflow/README.md

@@ -2,3 +2,4 @@
 - [Project Features](project_features.md)
 - [Authorization for merge requests](authorization_for_merge_requests.md)
 - [Groups](groups.md)
+- [Labels](labels.md)

doc/workflow/labels.md

+# Labels
+
+In GitLab, you can easily tag issues and merge requests. If you have permission level `Developer` or higher, you can manage labels. To create, edit or delete a label, go to a project and then to `Issues` and then `Labels`.
+
+Here you can create a new label.
+
+![new label](labels/label1.png)
+
+You can choose to set a color.
+
+![label color](labels/label2.png)
+
+If you want to change an existing label, press edit next to the listed label.
+You will be presented with the same form as when creating a new label.
+
+![edit label](labels/label3.png)