New information on homepage and videos (#11)

* Text for Tutorials

* Add Metadata-Video

* Homepage: Description, Information about „What is Thunder?“

_data/tutorials.yml

@@ -5,6 +5,9 @@
     - title: How to manage media
       include: tutorials/howto-article-media.md
       id: howto-article-media
+    - title: How to add meta data
+      include: tutorials/howto-article-metadata.md
+      id: howto-article-metadata
 - title: How to set-up things
   include: tutorials/howto-setup.md
   id: howto-setup

_includes/tutorials/howto-article-media.md

@@ -1,3 +1,3 @@
 {% include youtube.html id="THclTgZ4qIk" %}
 
-[WIP]
+In this tutorial, you can learn how to add a gallery, how to set the focal point, and how to add a Youtube or Vimeo video to the article.

_includes/tutorials/howto-article-metadata.md

@@ -0,0 +1,3 @@
+{% include youtube.html id="Cdp9e7Qv30o" %}
+
+In this tutorial, you can learn how to manage revisions, how to work with meta tags and the XML sitemap, how to schedule your article, how to change the URL, how to promote the article, and how to change author and publishing date.

_includes/tutorials/howto-article.md

@@ -1,3 +1,3 @@
 {% include youtube.html id="supI1IE0P2M" %}
 
-[WIP]
+In this tutorial, you can learn how to create and publish an article – how to add basic information and a teaser, how to enter text and how to use paragraphs to add and manage content.

_includes/tutorials/howto-setup-install-local.md

@@ -1,3 +1,3 @@
 {% include youtube.html id="7iNKJIMTcMI" %}
 
-[WIP]
+In this tutorial, you can learn how to install Thunder locally with [Acquia DevDesktop](https://dev.acquia.com/downloads). Find more information about Acquia DevSektop on [docs.acquia.com/dev-desktop](https://docs.acquia.com/dev-desktop).

index.md

@@ -7,6 +7,13 @@ permalink: /
 <img src="assets/logos/Thunder.svg" alt="Thunder Logo" width="400" />
 
 ## Description
+Thunder is a Drupal 8 distribution for professional publishers. It consists of the current Drupal 8 functionality, lots of handpicked publisher-centric modules with custom enhancements, and an environment which makes it easy to install, deploy and add new functionality.
+
+Thunder users also benefit from a whole range of channel- and feature-specific enhancements through collaboration with industry partners such as [nexx.tv](http://www.nexx.tv/), [Riddle](https://www.riddle.com), and [Valiton](https://www.valiton.com/).
+
+In 2016, the German publisher [Hubert Burda Media](http://www.hubert-burda-media.com/) established the Thunder Coalition, which aims at joining forces amongst publishers by sharing code and innovation power.
+
+As members of the Thunder Coalition, publishers, industry partners, and developers develop useful modules and extensions, use them for their own purposes and share them with the Coalition by publishing them under the GNU General Public License to further enhance Thunder.
 
 ## Feature Highlights
 * **Create articles dynamically with paragraphs**: Using paragraphs, you can add text with a WYSIWYG-editor, pictures, videos, Instagram or Twitter cards to your article – and change the order by dragging and dropping the content wherever you like it. Thanks to a preview mode, you get a good idea of how your article will look like in the end.
@@ -31,12 +38,28 @@ permalink: /
 7. Now you could choose additional modules, but for an easy start, we recommend using the default selection. Click on “Save and Continue” for the last time.
 8. You’re done! Your Thunder site opens and you can start the tour to show you around.
 
-## What is Thunder
-1. Detailed Feature-List
-2. Who is doing it
-3. How can I contact
-4. Slack
-5. Roadmap (only main features)
+## What is Thunder?
+### 1. What do I get with Thunder? (feature-list)
+### 2. Who is doing this?
+The distribution is maintained by the Thunder Core Team. The Thunder Core Team are a small number of publishing experts and computer scientists led by Ingo Rübe, CTO at Hubert Burda Media. They maintain the distribution, handle industry relations, publishers’ requests and offers as well as specialists training. They also run the Coalition’s infrastructure (like [thunder.org](http://thunder.org/)) and organize events. Plus, the Core Team decides which modules are added to or removed from the distribution. The Core Team also ensures that all basic functionality is available free of charge.
+### 3. How to reach the Thunder Core Team?
+We would love to hear about your plans for using Thunder, your feature requests, your potential needs, and your contributions to Thunder and the Community. Follow the @ThunderCoreTeam on [Twitter](https://twitter.com/ThunderCoreTeam) and get the latest news about Thunder-related topics.
+Apart from that, we are available for you at [[email protected]](mailto:[email protected]) and [[email protected]](mailto:[email protected]) and on the phone: +49 (89) 9250-4617.
+### 4. Want to chat?
+And if you like to chat, join our Slack team at [thunder.org/slack](http://www.thunder.org/slack).
+### 5. What’s coming? (roadmap)
+### 6. Wanna support us?
+If you want to help… Here are some things we believe to be important for publishers, but which we are not working on right now:
+* [Workflow initiative](https://www.drupal.org/node/2721129)
+* Keep the reader engaged with a pop-up at the end of the article, recommending other articles or visiting the homepage or similar things
+* Give readers a chance to react to an article and to send a message to the editor
+* Auto-saving for article editor
+* Set the focal point automatically (for example, at the eyes of a portrayed person)
+* Introduce the paging of article, so one article could consist of multiple pages to click through
+* Help with the documentation: proofread and improve our documentation - or volunteer to add something missing
+
+Feel free to start working on any of these topics. To make sure your developments will find their way into the Thunder distribution, please involve us at an early state. We aim at keeping Thunder as modular as possible.
+And if you don’t feel like you could do this on your own - no problem. That’s what the community is for! Just tell us if you want to work on one of the topics or if you have any idea how to implement the needed functionality. 
 
 ## [Tutorials](tutorials)
 1. How to write an article