Update README

README.md

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-Example plain HTML site using GitLab Pages. Read more at https://doc.gitlab.com/ee/pages/
+![Build Status](https://gitlab.com/pages/plain-html/badges/master/build.svg)
+
+---
+
+Example plain HTML site using GitLab Pages.
+
+Learn more about GitLab Pages at https://pages.gitlab.io and the official
+documentation http://doc.gitlab.com/ee/pages/README.html.
+
+---
+
+<!-- START doctoc generated TOC please keep comment here to allow auto update -->
+<!-- DON'T EDIT THIS SECTION, INSTEAD RE-RUN doctoc TO UPDATE -->
+**Table of Contents**  *generated with [DocToc](https://github.com/thlorenz/doctoc)*
+
+- [GitLab CI](#gitlab-ci)
+- [GitLab User or Group Pages](#gitlab-user-or-group-pages)
+- [Did you fork this project?](#did-you-fork-this-project)
+- [Troubleshooting](#troubleshooting)
+
+<!-- END doctoc generated TOC please keep comment here to allow auto update -->
+
+## GitLab CI
+
+This project's static Pages are built by [GitLab CI][ci], following the steps
+defined in [`.gitlab-ci.yml`](.gitlab-ci.yml):
+
+```
+pages:
+  stage: deploy
+  script:
+  - mkdir .public
+  - cp -r * .public
+  - mv .public public
+  artifacts:
+    paths:
+    - public
+  only:
+  - master
+```
+
+## GitLab User or Group Pages
+
+To use this project as your user/group website, you will need one additional
+step: just rename your project to `namespace.gitlab.io`, where `namespace` is
+your `username` or `groupname`. This can be done by navigating to your
+project's **Settings**.
+
+Read more about [user/group Pages][userpages] and [project Pages][projpages].
+
+## Did you fork this project?
+
+If you forked this project for your own use, please go to your project's
+**Settings** and remove the forking relationship, which won't be necessary
+unless you want to contribute back to the upstream project.
+
+## Troubleshooting
+
+1. CSS is missing! That means that you have wrongly set up the CSS URL in your
+   HTML files.
+
+[ci]: https://about.gitlab.com/gitlab-ci/
+[userpages]: http://doc.gitlab.com/ee/pages/README.html#user-or-group-pages
+[projpages]: http://doc.gitlab.com/ee/pages/README.html#project-pages