Add basic XHR request.

index.html

-hej hej hej
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+<div id="widget">
+    loading...
+</div>
+<script>
+
+    document.addEventListener('DOMContentLoaded', function(){
+        var xhr = new XMLHttpRequest();
+        xhr.onreadystatechange = function() {
+            if (xhr.readyState == XMLHttpRequest.DONE) {
+                document.getElementById('widget').innerHTML = xhr.responseHtml;
+            }
+        }
+        xhr.open('GET', 'http://smog.telemabk.pl/view', true);
+        xhr.send(null);
+    });
+
+</script>
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