Add new Linux quickstart to documentation

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+= Quickstart for Installing Gerrit on Linux
+
+This quickstart shows you how to install Gerrit on a Linux machine.
+
+[NOTE]
+====
+The installation steps provided in this quickstart are for
+demonstration purposes only. They are not intended for use in a production
+environment.
+
+For a more detailed installation guide, see
+link:install.txt[Standalone Daemon Installation Guide].
+====
+
+== Before you begin
+
+To complete this quickstart, you need:
+
+. A Unix-based server such as any of the Linux flavors or BSD.
+. Java SE Runtime Environment version 1.8 or later.
+
+== Download Gerrit
+
+From the Linux machine on which you want to install Gerrit:
+
+. Open a terminal window.
+. Download the Gerrit archive. See
+link:https://gerrit-releases.storage.googleapis.com/index.html[Gerrit Code
+Review - Releases] for a list of available archives.
+
+The steps in this quickstart used Gerrrit 2.14.2, which you can download using
+a command such as:
+
+....
+wget https://www.gerritcodereview.com/download/gerrit-2.14.2.war
+....
+
+NOTE: If you want to build and install Gerrit from the source files, see
+link:dev-readme.html[Developer Setup].
+
+== Install and initialize Gerrit
+
+From the command line, type the following:
+
+....
+java -jar gerrit*.war init --batch --dev -d ~/gerrit_testsite
+....
+
+The preceding command uses two parameters:
+
+* `--batch`. This parameter assigns default values to a variety of Gerrit
+  configuration options. To learn more about these configuration options, see
+  link:config-gerrit.html[Configuration].
+* `--dev`. This parameter configures the server to use the authentication
+  option, `DEVELOPMENT_BECOME_ANY_ACCOUNT`. This authentication type makes it
+  easy for you to switch between different users to explore how Gerrit works.
+  To learn more about setting up Gerrit for development, see
+  link:dev-readme.html[Developer Setup].
+
+This command displays a number of messages in the terminal window. The following
+is an example of these messages:
+
+....
+Generating SSH host key ... rsa(simple)... done
+Initialized /home/gerrit/gerrit_testsite
+Executing /home/gerrit/gerrit_testsite/bin/gerrit.sh start
+Starting Gerrit Code Review: OK
+....
+
+The last message you should see is `Starting Gerrit Code Review: OK`. This
+message informs you that the Gerrit service is now running.
+
+== Update the listen URL
+
+Another recommended task is to change the URL that Gerrit listens to from `*`
+to `localhost`. This changes helps prevent outside connections from contacting
+the instance.
+
+....
+git config --file gerrit_testsite/etc/gerrit.config httpd.listenUrl 'http://localhost:8080'
+....
+
+== Restart the Gerrit service
+
+You must restart the Gerrit service for your authentication type and listen URL
+changes to take effect.
+
+....
+~/gerrit_testsite/bin/gerrit.sh restart
+....
+
+== Viewing Gerrit
+
+At this point, you have a basic installation of Gerrit. You can view this
+installation by opening a browser and entering the following URL:
+
+....
+http://localhost:8080
+....
+
+== Next steps
+
+Through this quickstart, you now have a simple version of Gerrit running on your
+Linux machine. You can use this installation to explore the UI and become
+familiar with some of Gerrit's features. For a more detailed installation guide,
+see link:install.txt[Standalone Daemon Installation Guide].
+
+To learn more about Gerrit, see the following How-to topics:
+
+* Adding users to Gerrit
+* Cloning a repository into Gerrit
+* Making a change
+* Reviewing a change
+
+GERRIT
+------
+
+Part of link:index.html[Gerrit Code Review]
+
+SEARCHBOX
+---------