add missing license file and installation instructions

LICENSE.md

@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2013 Clay Gregory
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -39,8 +39,20 @@ A simple Munin plugin for monitoring elasticsearch nodes in Ruby. Depends on [JS
 
 `elasticsearch_store` - Size of index on disk
 
+
+## Installation
+
+See the [Munin documentation](http://guide.munin-monitoring.org/) for complete instructions on [plugin usage](http://guide.munin-monitoring.org/en/latest/plugin/use.html). In short, once `elasticsearch_` is in your plugin directory, create symlinks for each desired mode in your Munin service dir (usually `/etc/munin/plugins/`). For example, to enable JVM monitoring:
+
+```bash
+ln -s /usr/local/munin/lib/plugins/elasticsearch_ /etc/munin/plugins/elasticsearch_jvm
+```
+
+
 ## Configuration
 
+You'll also need to create a configuration file for the plugin, usually this would be `/etc/munin/plugin-conf.d/elasticsearch`.
+
 ### Variables
  * host - a elasticsearch node capable of providing stats interface (default localhost)
  * port - elasticsearch HTTP API port (default 9200)
@@ -54,3 +66,7 @@ env.port 9200
 env.node pinky rat
 ```
 
+## License
+
+See the included [LICENSE](LICENSE.md) for rights and limitations under the terms of the MIT license.
+