Updated readme for deb installation

Author: jerblack

README.md

@@ -1,2 +1,55 @@
 # autoupdater
-autoupdater is a systemd service that runs on a systemd.timer to automatically run apt update, upgrade, autoremove, and autoclean. on a schedule. This service will be provided as a deb package and should be apt installable at some point in the future.
+Autoupdater uses systemd to automatically run apt-get update, upgrade, autoremove, and autoclean to update Ubuntu/Debian-based systems on a schedule. 
+
+The provided deb package will install 3 files on your system
+
+- /usr/bin/autoupdater  
+This is the script that the service runs to execute the apt-get commands.
+This script takes the following switches, which are passed to it by the service:
+```
+ -a automatically reboot if needed (does not reboot by default)
+ -r when to reboot if needed (now, 3:00 (3am on 24 hr clock), 18:00 (6pm on 24 hr clock), +2h)
+ -m do not run autoremove (runs by default)
+ -c do not run clean (runs by default)
+```
+- /lib/systemd/system/autoupdater.service  
+This service file does not execute on it's own, but is instead executed by the timer file.
+You can modify this service file to change the options that are passed to the script.
+When this service is started, it runs /usr/bin/autoupdater with the specified switches and then exits on completion.
+
+- /lib/systemd/system/autoupdater.timer  
+The timer file is responsible for starting the service on a schedule. There are two options you can change here. The values shown are the current defaults.  
+```
+# Time to wait after booting before we run first time
+OnBootSec=10min
+# Time between running each consecutive time
+OnUnitActiveSec=12h
+```
+
+If you make changes to any of these files, you will need to run this afterwards:
+
+    sudo systemctl daemon-reload
+
+
+### Installation
+The simplest way to install is using the provided deb package:
+```bash
+sudo dpkg -i autoupdater.deb
+```
+To uninstall the service:
+```bash
+sudo dpkg -P autoupdater
+```
+
+
+### Logging
+Systemd logs to the built in journal by default, and all writes to stdout are visible in the journal.  
+To view the logs for this service:
+```bash
+journalctl -u autoupdater.service
+```
+
+You can also view the current state of the service by running:
+```bash
+systemctl autoupdater status
+```