Added build instructions to README.

README.md

@@ -9,6 +9,36 @@ The Zappos API has reasonably complete documentation at
 will need an API key (available for free upon request from
 Zappos).
 
+# Building
+
+Dependency resolution and the project build are managed with
+[Maven](http://maven.apache.org/).
+
+## Tests
+
+Builds will automatically run tests that require a Zappos API
+key. If you wish to run these tests yourself:
+
+1. Copy the file `src/test/resources/apikey.properties.template` to `src/test/resources/apikey.properties`
+2. Fill in your API key on the appropriate line in `apikey.properties`
+
+If you would like to disable these tests, add the argument
+`-Dskiptests` to all invocations of `mvn`.
+
+## Installing locally
+
+Run `mvn install` to install the library to your local Maven
+repository. Any other projects managed with Maven will be able
+to find it.
+
+## Building a standalone jar
+
+If you don't manage your dependencies with Maven, you can still
+build a stand-alone jar. Running `mvn package` will build jars
+in `target/`. You can add the `-jar-with-dependencies.jar` file
+that is built to your project's classpath, and you should be
+able to use Zappy from there.
+
 # Using the library
 
 There is a class for each of the supported API search predicates: