Create the rest of the wiki docsdocs/wikis

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diff --git a/doc/user/project/wiki/img/wiki_create_new_page.png b/doc/user/project/wiki/img/wiki_create_new_page.png
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diff --git a/doc/user/project/wiki/img/wiki_sidebar.png b/doc/user/project/wiki/img/wiki_sidebar.png
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diff --git a/doc/user/project/wiki/index.md b/doc/user/project/wiki/index.md
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@@ -24,28 +24,74 @@ when viewing a Wiki. You only have to fill in the **Content** section and click
 **Create page**. You can always edit it later, so go ahead and write a welcome
 message.
 
-![New home page](img/wiki_create_new_page.png)
-
-Read more in the [Creating a new wiki page](#creating-a-new-wiki-page) section.
+![New home page](img/wiki_create_home_page.png)
 
 ## Creating a new wiki page
 
+Create a new page by clicking the **New page** button that can be found
+in all wiki pages. You will be asked to fill in the page name from which GitLab
+will create the path to the page. You can specify a full path for the new file
+and any missing directories will be created automatically.
+
+![New page modal](img/wiki_create_new_page_modal.png)
+
+Once you enter the page name, it's time to fill in its content. GitLab wikis
+support Markdown, RDoc and AsciiDoc. For Markdown based pages, all the
+[Markdown features](../../markdown.md) are supported and for links there is
+some [wiki specific](../../markdown.md#wiki-specific-markdown) behavior.
+
+>**Note:**
+The wiki is based on a Git repository and contains only text files. Uploading
+files via the web interface will upload them in GitLab itself, and they will
+not be available if you clone the wiki repo locally.
+
 In the web interface the commit message is optional, but the GitLab Wiki is
 based on Git and needs a commit message, so one will be created for you if you
 do not enter one.
 
+When you're ready, click the **Create page** and the new page will be created.
+
+![New page](img/wiki_create_new_page.png)
+
 ## Editing a wiki page
 
+To edit a page, simply click on the **Edit** button. From there on, you can
+change its content. When done, click **Save changes** for the changes to take
+effect.
+
 ## Deleting a wiki page
 
+You can find the **Delete** button only when editing a page. Click on it and
+confirm you want the page to be deleted.
+
 ## Viewing a list of all created wiki pages
 
+Every wiki has a sidebar from which a short list of the created pages can be
+found. The list is ordered alphabetically.
+
+![Wiki sidebar](img/wiki_sidebar.png)
+
+If you have many pages, not all will be listed in the sidebar. Click on
+**More pages** to see all of them.
+
 ## Viewing the history of a wiki page
 
-## Using different markup languages
+The changes of a wiki page over time are recorded in the wiki's Git repository,
+and you can view them by clicking the **Page history** button.
+
+From the history page you can see the revision of the page (Git commit SHA), its
+author, the commit message, when it was last updated and the page markup format.
+To see how a previous version of the page looked like, click on a revision
+number.
+
+![Wiki page history](img/wiki_page_history.png)
 
 ## Adding and editing wiki pages locally
 
-## Disabling the wiki from your project
+Since wikis are based on Git repositories, you can clone them locally and edit
+them like you would do with every other Git repository.
+
+On the right sidebar, click on **Clone repository** and follow the on-screen
+instructions.
 
 [permissions]: ../../permissions.md