TINY-1195: add info on getMetadata for custom plugins

advanced/creating-a-plugin.md

@@ -85,6 +85,15 @@ tinymce.PluginManager.add('example', function(editor, url) {
       });
     }
   });
+
+  return {
+    getMetadata: function () {
+      return  {
+        title: "Example plugin",
+        url: "http://exampleplugindocsurl.com"
+      };
+    }
+  };
 });
 ```
 
@@ -100,6 +109,10 @@ tinymce.init({
 });
 ```
 
+## Exposing metadata
+
+You can expose metadata from your plugin by returning an object with the property `getMetadata` with a function that returns an object with a `title` and `url` property. This metadata will then be used by the [Help Plugin]({{ site.baseurl }}/plugins/help/) to show the correct name and link for your plugin in the Plugins installed tab. See test plugin above for example.
+
 ## Language localization
 
 If you want to have custom translations for your plugin you need to create a "langs" directory in your plugin directory. TinyMCE will then try to load language files based on the specified language core for example if the language is "sv_SE" it will try to load ```'<your plugin>/langs/sv_SE.js'```.

plugins/help.md

@@ -25,3 +25,7 @@ tinymce.init({
   toolbar: "help"
 });
 ```
+
+## Exposing metadata for the help plugin
+
+For information on how to expose metadata from you custom plugin to add it to the Installed plugins list in the Help plugin, see the  [Creating a Plugin page]({{ site.baseurl }}/advanced/creating-a-plugin/#exposingmetadata).