New favorites article (#106)

New feature article showing users how to uses favorites.

Co-authored-by: BitwardenLuc <59910153+BitwardenLuc@users.noreply.github.com>

_articles/features/favorites.md

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+---
+layout: article
+title: Using favorites
+categories: [features]
+featured: false
+popular: false
+tags: [favorites, features, tutorial]
+---
+
+Favorites allow you to quickly access your most used items. Any item can be designated as a Favorite. 
+
+This includes items that have been shared with you from an Organization. Marking an Organization item as a Favorite will only pertain to your individual vault. It will not make the item a Favorite for all users of the Organization that it belongs to.
+
+## Using Favorites
+
+Select the item that you wish to make a Favorite and edit it. There will be an option labeled "Favorite" or a "Star" icon depending on the Bitwarden client being used. Select the corresponding object and save the item.
+
+The mobile application's and browser extension will list favorited items at the top of the "My Vault" tab.
+
+The Web Vault and desktop application will have a "Favorites" filter you can select to see only these items.
+
+### Examples
+- Web Vault
+![Web Vault](/images/favorites/favorite_webvault.gif){:class="img-responsive"}
+​
+- Desktop Application
+![Desktop](/images/favorites/favorite_desktop.gif){:class="img-responsive"}
+​
+- Browser Extension
+![Extension](/images/favorites/favorite_extension.gif){:class="img-responsive"}