added more detailed download instructions

index.html

@@ -29,9 +29,20 @@ <h3>Joshua</h3>
 <h3>Download</h3>
 
 <p>
-Joshua's source code is available at <a href="https://github.com/joshua-decoder/joshua">https://github.com/joshua-decoder/joshua</a>.
+Joshua's source code is available
+at <a href="https://github.com/joshua-decoder/joshua">https://github.com/joshua-decoder/joshua</a>.
+To clone the repository (which downloads the complete source code),
+you can type:
 </p>
 
+<pre>
+  git clone https://joshua-decoder@github.com/joshua-decoder/joshua.git
+</pre>
+
+Doing this will enable you to easily pull down bugfixes as they are
+discovered and fixed.  If you prefer, you can also download a ZIP file
+archive by following the code link above and clicking the "ZIP" button.
+
 <h3>Usage</h3>
 
 <p>