Add documentation introduction article

This is part of the old TrueOS documentation (https://github.com/project-trident/trident-docs/blob/master/introducing.md), reworked for Project Trident as an introductory article.
Please look over the text and make suggestions for additions/removals.

hugo-site/content/docs/introduction.md

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+# Introduction
+
+Welcome to Project Trident!
+
+Project Trident is a desktop distribution of [TrueOS](https://www.trueos.org), which is a rolling-release variant of [FreeBSD](https://www.freebsd.org).
+The goal of the Project is to provide a simple, secure, and highly usable FreeBSD experience.
+Project Trident is completely independent and financially backed through the generous contributions of the Open Source community.
+
+[Project Trident](https://www.Trident.org) began in 2018 when TrueOS was reorganized into a scaled down server installation of FreeBSD.
+The discontinued desktop portion of TrueOS was taken by Ken Moore and J.T. Pennington and rebuilt into Project Trident.
+
+Project Trident is essentially a customized installation of TrueOS and FreeBSD, not a forked derivative.
+Project Trident has a simple graphical installer that has partition support and other customization.
+The underlying TrueOS/FreeBSD system is kept intact and provides a fully functional FreeBSD system.
+Other differences from FreeBSD include:
+
+-   Project Trident pre-configures the BSD-licensed Lumina desktop environment.
+    Additional desktop environments can be installed and appear in the graphical login menu.
+
+-   The Project Trident installer supports configuring ZFS partitions during installation.
+
+-   Project Trident has both graphical and command line software management systems.
+
+-   Project Trident provides many graphical utilities for system configuration and management.
+
+-   Project Trident comes pre-configured with a number of automatic scripts connecting USB memory sticks.
+
+-   The Project Trident boot menu supports boot environments or snapshots of the operating system.
+    The System Update Manager automatically creates a new boot environment before every update.
+    If an update fails, the system can be rebooted into an earlier boot environment.
+    This allows for easy recovery if any issues happen during the update process.
+
+These articles cover the installation and use of Project Trident.
+All documentation must be considered a "work in progress" and is wholly dependent on Project Trident community contributions.
+
+## Features
+
+Project Trident provides many features:
+
+-   **Easy installation:** Insert the installation media and reboot the system to start the installer.
+    Fill in the prompts in the installation menus.
+
+-   **Automatically configured hardware:** Video, sound, network, and other devices automatically configure during installation.
+
+-   **Customizable desktop interface:** Project Trident installs the Lumina desktop by default.
+    Additional desktop environments can also be installed to support user preferences.
+
+-   **Easy software management:** The AppCafe makes installing, upgrading, and uninstalling software safe and easy.
+
+-   **Lots of software available:** Most software ported to FreeBSD is available on Project Trident.
+    There are currently over 26,100 applications available on FreeBSD.
+
+-   **Easy to update:** Project Trident has a built-in System Update Manager.
+    This notifies the user about available updates and makes it easy to apply TrueOS security fixes, bug fixes, and system enhancements.
+    Additionally, the Update Manager is used to upgrade the operating system or update installed software.
+
+-   **No fragmentation:** Project Trident hard drives never need defragmenting and are formatted with OpenZFS, a self-healing filesystem.
+
+-   **Laptop support:** Provides power saving and automatic switching between wired and wifi network connections.
+    The rolling release model of Project Trident provides an environment to quickly add support for new hardware.
+
+-   **Easy system administration:** Project Trident provides many graphical tools for performing system administration.
+
+-   **Vibrant community:** Project Trident has a friendly and helpful community.