Changes

Added simple installation guide
== Windows ==

# Download the latest version of Railway Operation Simulator [https://www.railwayoperationsimulator.com/catalog/base-program/railway-operation-simulator here].
# Unzip the downloaded file.
# Copy the <code>Railway</code> folder to somewhere safe.
# You can run ROS using <code>railway.exe</code> in the <code>Railway</code> folder.