Add query builder template

web/app/templates/modals/query_builder.html.j2

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+<!-- Modal showing the corpus files for the current query results including title ant match count per corpus file. -->
+<div id="query-builder-modal" class="modal">
+  <div class="col s12 modal-content">
+    <p>Test</p>
+  </div>
+  <div class="col s12 modal-footer">
+    <a href="#!" class="btn modal-close waves-effect waves-green btn">Done</a>
+  </div>
+</div>