index.html: Add a 'Downloads' section

So we can collect a list of everything learners will need for the
workshop [1].

[1]: carpentries#276

CUSTOMIZATION.md

@@ -97,9 +97,9 @@ so that they show what you're actually planning to teach and when.
 
 ## Home Page: Setup
 
-You should delete the pieces of the `Setup` section
-related to software you will not be using in your workshop,
-so that learners don't spend time installing software they don't need.
+You should delete the pieces of the `Setup` and `Downloads` sections
+related to software/downloads you will not be using in your workshop,
+so that learners don't spend time installing software/downloads they don't need.
 After you edit the `Setup` section, you should edit the installation test script.
 
 `swc-installation-test-1.py` is pretty simple, and just checks that

index.html

@@ -109,8 +109,9 @@ <h2 id="general">General Information</h2>
 <p id="requirements">
   <strong>Requirements:</strong> Participants must bring a laptop with
   a few specific software packages installed (listed
-  <a href="#setup">below</a>). They are also required to abide by
-  Software Carpentry's
+  <a href="#setup">here</a>) and example data-sets downloaded
+  (listed <a href="#downloads">here</a>). They are also required to
+  abide by Software Carpentry's
   <a href="{{site.swc_site}}/conduct.html">Code of Conduct</a>.
 </p>
 
@@ -705,3 +706,22 @@ <h3>Virtual Machine</h3>
   </ol>
 </div>
 -->
+
+<!--
+  DOWNLOADS
+
+  Links to learner downloads (e.g. datasets needed by lessons).
+  Delete/modify as needed to match the lessons you are covering.
+-->
+
+<h2 id="downloads">Downloads</h2>
+
+<p>
+  The following downloads and data-sets will be used during the
+  workshop.  Please download and save them in a location you can find
+  for the workshop (for example, your desktop or your downloads
+  directory).
+</p>
+
+<list class="downloads">
+</list>