Add instructions for creating a redirect

CONTRIBUTING.adoc

@@ -440,6 +440,27 @@ presentations and links to documentation.  A page "Jenkins for C/C++" would
 still be relatively specific, and could easily include a section for Visual
 C++/Windows specific content.
 
+==== Adding a Redirect page
+
+Sometimes we need a page in the site that automatically redirects us to another page.
+Common cases for a page redirect include:
+
+Links from core or a plugin to commonly requested information::
+The Jenkins 'reverse proxy configuration' page or the 'How to report an issue' page.
+Jenkins includes a hyperlink to a specific jenkins.io page and the jenkins.io page redirects to the preferred location.
+The preferred location can be changed without modifying the sofware that includes the hyperlink.
+
+Page replacement or removal::
+Sometimes a page needs to be moved or removed.
+When the user opens the moved page, the redirect automatically opens the new location.
+When the user opens the removed page, the redirect can take them to a different location or to the `/404/index.html` "not found" page
+
+Redirects are implemented with a `layout: redirect` and the property `redirect_url` assigned the URL to the destination of the redirect.
+Redirects can be placed in any of the content locations (like `projects/` and `docs/`).
+Redirects that need a shorter link are created by convention in the `content/redirect/` folder
+
+Oleg Nenashev has provided a link:https://youtu.be/-cGeb2wtg4I[brief video tutorial] that shows how to create and test a redirect with jenkins.io.
+
 ==== Moving documentation from Jenkins Wiki
 
 The Jenkins project is moving documentation pages from the link:https://wiki.jenkins.io[Jenkins Wiki] to link:https://jenkins.io[www.jenkins.io].