Merge branch 'docs-add-gitlabci-file' into 'master'

Add description how to set custom CI file

See merge request gitlab-org/gitlab-ce!31445

Author: eread

doc/user/project/pipelines/settings.md

@@ -76,6 +76,13 @@ Here are some valid examples:
 - `my/path/.gitlab-ci.yml`
 - `my/path/.my-custom-file.yml`
 
+The path can be customized at a project level. To customize the path:
+
+1. Go to the project's **Settings > CI / CD**.
+1. Expand the **General pipelines** section.
+1. Provide a value in the **Custom CI config path** field.
+1. Click **Save changes**.
+
 ## Test coverage parsing
 
 If you use test coverage in your code, GitLab can capture its output in the