Added package installation instructions.

README.md

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 # landfirevegmodels
 A SyncroSim base package to deliver LANDFIRE STSM vegetation models
+
+**Installation Instructions**
+
+1. Download and install SyncroSim from  https://syncrosim.com/download/ 
+2. Eventually this package will be added to the SyncroSim package server and you will be able to install it by opening the SyncroSim user interface and selecting **File | Packages... | Install...**
+3. For now you can get the latest version of this package here:  https://github.com/ApexRMS/landfirevegmodels/releases. Download the *landfirevegmodels.ssimpkg* file to a local folders then open SyncroSim and select **File | Packages... | Install from file...** and navigate to this file on your computer
+4. In SyncroSim select **File | New Library...**,  then select the *landfirevegmodels* base package and the *Reference Models* template library.  Enter a **Filename** (ok to keep the default) and a **Folder** for your new library and click **OK**. Your library will be created from an online template.
+5. For more documentation on the SyncroSim user interface see:  http://docs.syncrosim.com/getting_started/quickstart.html 
+6. *landfirevegmodels* is a wrapper package for the ST-Sim package for SyncroSim.  For more information on ST-Sim see:  http://docs.stsim.net/ 
+