DOCS Add instructions for Application to a Portfolios (#2014)

* Add instructions on adding an Application to a Portfolios

* Edit following review

* Fix broken link

server/sonar-docs/src/pages/project-administration/configuring-portfolios-and-applications.md

@@ -31,6 +31,14 @@ To add projects directly to a Portfolio or standard sub-Portfolio first make sur
 * **Regular Expression** – specify a regular expression and projects with a matching name OR key will be included.
 * **All Remaining Projects** – choose this option to add all projects not already included in this Portfolio (directly or via sub-Portfolio).
 
+## Adding Applications to a Portfolio
+To add an Application to a Portfolio, first make sure your Application is [already created](/user-guide/applications/). Then:
+1. Navigate to the Portfolios configuration page by going to **[Administration > Configuration > Portfolios](/#sonarqube-admint#/admin/extension/governance/views_console/)**.
+2. Select the Portfolio where you want to add your Application
+3. Click **Add Portfolio**
+4. Select **Local Reference**
+5. Choose your Application from the drop-down list and click **Add**.
+
 [[info]]
 |**Project unicity under a portfolio**<br/><br/>
 |Projects, applications and sub-portfolios can only appear once in any given hierarchy in order to avoid magnifying their impacts on aggregated ratings. The portfolio configuration interface has some logic to prevent obvious duplications (e.g. manually adding the same project), however in case of more subtle duplications (e.g. due to regex, or other bulk definition), then the calculation of that portfolio will fail with a helpful error message.