Added a README.md file

README.md

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+
+# Mike's Disk Usage Warn Thing
+
+This is a simple script that will emit a warning to stderr when your disk usage surpasses a configured threshold. StdErr output was chosen for its simplicity, and because it's very easy to configure a cron job to send you an email any time an error occurs.
+
+## Requirements
+
+* Python3
+
+* Python *pyaml* module
+  
+  Example:
+  
+  ``` sudo pip3 install pyaml```
+
+* *logger* program, which should be on most distributions
+
+## Installation
+
+1. First, make sure you have python3 and pip3 installed
+
+2. Use pip3 to make sure you have the python module "pyaml" installed
+
+3. Create a configuration file somewhere. 
+
+4. Create a Crontab entry that will call this script with an argument "--config" followed by the path to your configuration file.
+
+(examples found below)
+
+## Command Line Arguments
+
+This script needs command line arguments to work. Primarily, it needs to know the location of at least one valid configuration file
+
+### --config < path >
+
+Specifies a path to a configuration file or directory. If a directory is specified, it will be scanned for configuration files.
+
+### Example Call With Arguments
+
+Assuming you can invoke *Python 3* with the command ```python3```, here's a quick example using two configuration files:
+
+```
+python3 /path/to/disk-usage-warn --config "/my/config/path-1" --config "/my/config/path-2"
+```
+
+## Example Crontab Entry
+
+As mentioned, the easiest way to use this script is with Crontabs. By default, cron jobs will send you an email any time a script outputs to stdout or stderr. Since this script will output lots of information onto stdout, and only output to stderr when a disk has become full, it's useful to redirect stdout to /dev/null, like so:
+
+```
+python3 /path/to/disk-usage-warn --config "/path-to-config" > /dev/null
+```
+
+So, in order to run this script every 5 minutes, use something like the following:
+
+```
+*/5 * * * * python3 /path/to/disk-usage-warn --config "/path-to-config" > /dev/null
+```
+
+The examples above assume you can invoke *Python 3* with the command ```python3```.
+
+
+