Add simple README for generating cards

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+In order to create these cards, a development environent is required.
+
+In `templates/base.html`, uncomment the line
+
+    {#% block ogp %}{% endblock ogp %#}
+
+so that it looks like
+
+    {% block ogp %}{% endblock ogp #}
+
+and then open the page `/ogp/`.  With FireFix, right click on the page and
+select "Take Screenshot".  Select the element containing the card and download
+it.
+
+All "Interview with <sponsor>" cards are automatically generated for all
+sponsors (whether they get an interview or not).  For other, more general
+cards, edit the list in `templates/pages/ogp.html`.
+
+Do not commit the change to `templates/base.html`.