Added requirements, incomplete install instructions to README

README.md

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+# 7 Days To Die Game Server Linux Scripts
+A set of opinionated scripts used to manage 7 days to die.
+
+# Table of Contents
+[_TOC_]
+
+# Requirements
+- Required
+    - [tmux](https://github.com/tmux/tmux)
+        - Used to run servers in detached sessions
+    - [steamcmd](https://developer.valvesoftware.com/wiki/SteamCMD)
+        - Used to install 7 days to die game servers
+
+- Optional
+    - [pv](https://github.com/icetee/pv)
+        - Used to show progress for backup operations
+
+# Automatic Installation
+*Must* be ran as root, requires `curl`.
+
+This will configure a user sdtd (Seven Days to Die), and install any [requirements](#requirements).
+
+```bash
+bash -c "$(curl )"
+```