Merge branch 'docs/wikis' into 'master'

Document wikis

Closes #7028

See merge request !11041

doc/README.md

@@ -92,7 +92,7 @@ Take a step ahead and dive into GitLab's advanced features.
 - [GitLab Pages](user/project/pages/index.md): Build, test, and deploy your static website with GitLab Pages.
 - [Snippets](user/snippets.md): Snippets allow you to create little bits of code.
-- [Wikis](workflow/project_features.md#wiki): Enhance your repository documentation with built-in wikis.
+- [Wikis](user/project/wiki/index.md): Enhance your repository documentation with built-in wikis.
 ### Continuous Integration, Delivery, and Deployment

doc/user/project/wiki/index.md

+# Wiki
+
+A separate system for documentation called Wiki, is built right into each
+GitLab project. It is enabled by default on all new projects and you can find
+it under **Wiki** in your project.
+
+Wikis are very convenient if you don't want to keep you documentation in your
+repository, but you do want to keep it in the same project where your code
+resides.
+
+You can create Wiki pages in the web interface or
+[locally using Git](#adding-and-editing-wiki-pages-locally) since every Wiki is
+a separate Git repository.
+
+>**Note:**
+A [permission level][permissions] of **Guest** is needed to view a Wiki and
+**Developer** is needed to create and edit Wiki pages.
+
+## First time creating the Home page
+
+The first time you visit a Wiki, you will be directed to create the Home page.
+The Home page is necessary to be created since it serves as the landing page
+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_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
+
+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
+
+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

doc/workflow/project_features.md

@@ -26,6 +26,8 @@ This is a separate system for documentation, built right into GitLab.
 It is source controlled and is very convenient if you don't want to keep you documentation in your source code, but you do want to keep it in your GitLab project.
+[Read more about Wikis.](../user/project/wiki/index.md)
+
 ## Snippets
 Snippets are little bits of code or text.