Merge branch 'docs-pre-selected-template-link' into 'master'

Docs - Prefilled fields for new issue link

See merge request gitlab-org/gitlab-ee!7796

doc/user/project/issues/create_new_issue.md

@@ -79,5 +79,23 @@ create issues for the same project.
 
 ![Create issue from group-level issue tracker](img/create_issue_from_group_level_issue_tracker.png)
 
+## New issue via URL with prefilled fields
+
+You can link directly to the new issue page for a given project, with prefilled
+field values using query string parameters in a URL. This is useful for embedding 
+a URL in an external HTML page, and also certain scenarios where you want the user to 
+create an issue with certain fields prefilled.
+
+The title, description, and description template fields can be prefilled using 
+this method. The description and description template fields cannot be pre-entered
+in the same URL (since a description template just populates the description field).
+
+Follow these examples to form your new issue URL with prefilled fields.
+
+- For a new issue in the GitLab Community Edition project with a pre-entered title
+and a pre-entered description, the URL would be `https://gitlab.com/gitlab-org/gitlab-ce/issues/new?issue[title]=Validate%20new%20concept&issue[description]=Research%20idea`
+- For a new issue in the GitLab Community Edition project with a pre-entered title
+and a pre-entered description template, the URL would be `https://gitlab.com/gitlab-org/gitlab-ce/issues/new?issue[title]=Validate%20new%20concept&issuable_template=Research%20proposal`
+
 [Markdown]: ../../markdown.md
 [quick actions]: ../quick_actions.md