Create wallabag2 documentation page - EN (#504)

- Create wallabag2 documentation page - EN
- Add link to wallabag2 doc

app_wallabag2.md

@@ -0,0 +1,33 @@
+## <img src="https://yunohost.org/images/Logo-wallabag-svg.svg">
+
+[Wallabag](https://www.wallabag.org/) is a self hostable Read-It-Later application allowing
+you to not miss any content anymore. Click, save, read it when you can.
+It extracts content so that you can read it when you have time.
+
+[![Install Wallabag v2 with 
+YunoHost](https://install-app.yunohost.org/install-with-yunohost.png)](https://install-app.yunohost.org/?app=wallabag2)
+
+It provides a web interface, browser (Firefox / Chrome / Opera) add-ons, mobile apps (Android / iOS / Windows Phone) and even on e-reader (PocketBook / Kobo)
+
+### Features
+
+In addition to Wallabag core features, the following are made available with
+this package:
+
+ * Integrate with YunoHost users and SSO - i.e. logout button
+ * Allow one user to be the administrator (set at the installation)
+ * Asynchronous import using Redis (need to be enabled in the *Internal Settings*). RabbitMQ import not supported (yet ?)
+
+### Links
+
+ * Report a bug: https://github.com/YunoHost-Apps/wallabag2_ynh/issues
+ * Wallabag website: https://www.wallabag.org/
+ * Wallabag documentation: https://doc.wallabag.org/ (fr/en/it/de)
+ * [Video demo](https://vimeo.com/video/167435064)
+ 
+----
+
+### Upgrade from v1.x
+
+No automatic upgrade process is available. You need a manual (but simple) migration from [Wallabag v1](https://github.com/YunoHost-Apps/wallabag_ynh).
+Please take a look at the [official documentation](https://doc.wallabag.org/en/user/import/wallabagv1.html).

sitemap.md

@@ -78,6 +78,7 @@
            * [Radicale](/app_radicale)
            * [RoundCube](/app_roundcube_en)
            * [Minidlna](app_minidlna_en)
+	   * [Wallabag v2](/app_wallabag2)
         * [Community applications](/apps_in_progress_en)
            * [LimeSurvey](/app_limesurvey_en)
 

userdoc.md

@@ -11,5 +11,6 @@
    * [Transmission](/app_transmission_en)
    * [Radicale](/app_radicale)
    * [RoundCube](/app_roundcube_en)
+   * [Wallabag v2](/app_wallabag2)
 * [Community applications](/apps_in_progress_en)
    * [LimeSurvey](/app_limesurvey_en)