Add instructions on how to contribute a "Built-In" template on projects/new"

app/views/projects/new.html.haml

@@ -48,7 +48,12 @@
           = form_for @project, html: { class: 'new_project' } do |f|
             = render 'new_project_fields', f: f, project_name_id: "blank-project-name"
 
-        .tab-pane.no-padding{ id: 'create-from-template-pane', class: active_when(active_tab == 'template'), role: 'tabpanel' }
+        #create-from-template-pane.tab-pane.px-0.pb-0{ class: active_when(active_tab == 'template'), role: 'tabpanel' }
+          .card-slim.m-4.p-4
+            %div
+              - contributing_templates_url = 'https://gitlab.com/gitlab-org/project-templates/contributing'
+              - link_start = '<a href="%{url}" target="_blank" rel="noopener noreferrer">'.html_safe % { url: contributing_templates_url }
+              = _('Learn how to %{link_start}contribute to the built-in templates%{link_end}').html_safe % { link_start: link_start, link_end: '</a>'.html_safe }
           = form_for @project, html: { class: 'new_project' } do |f|
             .project-template
               .form-group

changelogs/unreleased/xanf-gitlab-ce-add-template-link.yml

@@ -0,0 +1,5 @@
+---
+title: Add instructions on how to contribute a Built-In template for project
+merge_request: 26976
+author:
+type: other

locale/gitlab.pot

@@ -5260,6 +5260,9 @@ msgstr ""
 msgid "Lead"
 msgstr ""
 
+msgid "Learn how to %{link_start}contribute to the built-in templates%{link_end}"
+msgstr ""
+
 msgid "Learn more"
 msgstr ""