Merge pull request #1702 from edx/giulio/anon-user-id-yml

Adding a YAML file to demonstrate how to include anonymized user IDs in Studio elements.

common/lib/xmodule/xmodule/templates/html/anon_user_id.yaml

+---
+metadata:
+    display_name: Anonymous User ID
+data: |
+      <p>Your explanatory text here.</p>
+      <p><a href="https://YOUR_UNIVERSITY.qualtrics.com/SE/?SID=SV_###############&a=%%USER_ID%%" target="_blank">YOUR_LINK_TEXT</a></p>
+      
+      <!-- You can include %%USER_ID%% to include an anonymized user ID in your outside services so that you can relate them later.
+        
+        This example is a Qualtrics template:
+          - Replace the "###############" with your Survey ID.
+          - Also replace "YOUR_UNIVERSITY" with your qualtrics ID.
+          - Finally, replace "YOUR_LINK_TEXT" with your link text.
+          - If you wish to embed your survey into the courseware instead of opening a new tab, replace the above HTML with what is provided below.
+            
+            <p>Your explanatory text here.</p>
+            <iframe src="https://YOUR_UNIVERSITY.qualtrics.com/SE/?SID=SV_###############&a=%%USER_ID%%" height="1000" width="800" />
+        
+      -->