add query for detecting uses return-values from functions that does not return a value

javascript/ql/src/Statements/examples/UseOfReturnlessFunction.js

@@ -0,0 +1,9 @@
+var stage = require("./stage")
+
+function renderText(text, id) {
+    document.getElementById(id).innerText = text;
+}
+
+var text = renderText("Two households, both alike in dignity", "scene");
+
+stage.show(text);