add web widget example

README.md

@@ -1,8 +1,22 @@
 # viewcounter
 ethical view counting api
 
-## usage
-### requesting view counts
+## examples
+### embedded view counter
+```html
+<div id="view-count"></div>
+<script>
+	var req = new XMLHttpRequest();
+	req.addEventListener("load", function () {
+		document.getElementById("view-count")
+			.innerHTML = "<b>page views</b> " + JSON.parse(this.responseText).views;
+	});
+	req.open("POST", "/viewcounter");
+	req.send("/index.html");
+</script>
+```
+
+### requesting all view counts
 sending a GET request will return a json object with all the stored viewcounts
 ```sh
 $ curl localhost:8001/viewcounter