Add Quick Start

Quick-Start.md

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+# Quick Start
+
+This page covers the minimum steps to use or administer an
+Athenix-managed system.
+
+## End Users
+
+Update your system:
+
+```bash
+update-system
+```
+
+If you use an external user configuration:
+
+```bash
+sudo nixos-rebuild switch \
+  --flake git+https://git.factory.uga.edu/UGA-Innovation-Factory/athenix.git \
+  --impure
+```
+
+## Administrators
+
+Typical workflow:
+
+```bash
+vim inventory.nix
+nix flake check
+nix fmt
+git commit -am "Describe changes"
+git push
+```
+
+Users receive updates via `update-system`.