README: add marketplace as installation option

.github/template-cleanup/README.md

@@ -31,6 +31,13 @@ To keep everything working, do not remove `<!-- ... -->` sections.
   <kbd>Settings/Preferences</kbd> > <kbd>Plugins</kbd> > <kbd>Marketplace</kbd> > <kbd>Search for "%NAME%"</kbd> >
   <kbd>Install</kbd>
 
+- Using the Marketplace:
+
+  Go to the [Marketplace](https://plugins.jetbrains.com/plugin/MARKETPLACE_ID) and install it by clicking the <kbd>Install to ...</kbd> button in case your IDE is running.
+
+  You can also download the [latest release](https://plugins.jetbrains.com/plugin/MARKETPLACE_ID/versions) from the Marketplace and install it manually using
+  <kbd>Settings/Preferences</kbd> > <kbd>Plugins</kbd> > <kbd>⚙️</kbd> > <kbd>Install plugin from disk...</kbd>
+
 - Manually:
 
   Download the [latest release](https://github.com/%REPOSITORY%/releases/latest) and install it manually using