Add instructions for building and running Docker images

README.md

@@ -2,6 +2,9 @@
 Static web page generator for the Hacker Public Radio website.
 
 ## Installation
+
+### On local system
+
 * Clone or download this repository
 * With SQLite
 	* Create the sqlite3 database from the hpr.sql MySQL dump file available on
@@ -31,6 +34,10 @@ Static web page generator for the Hacker Public Radio website.
     * Text::CSV_XS
     * HTML::Entities
 
+### Using Docker
+
+* run: `docker build -t hpr/site-generator .`
+
 * See the [Getting Started](GETTING_STARTED.md) tutorial for more details on
   installing the HPR generator.