docs/website: add TkOS to the sponsors

Tk Open Systems has sponsored the Buildroot Association to organize
the Buildroot Developers Meeting.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

docs/website/sponsors.html

@@ -86,6 +86,23 @@
 	  </div>
 	</div>
 
+	<div class="col-sm-4">
+	  <div class="panel panel-default panel-sponsor">
+	    <div class="panel-body">
+	      <div class="col-sm-12">
+		<a href="http://www.tkos.col.il">
+		  <img class="img-responsive center-block" src="images/tkos-logo.png"/>
+		</a>
+	      </div>
+	      <div class="col-sm-12">
+		<a href="http://www.tkos.co.il">Tk Open Systems</a>
+		sponsored the event by contributing financially to
+		the <em>Buildroot Association</em>.
+	      </div>
+	    </div>
+	  </div>
+	</div>
+
 	<div class="col-sm-4">
 	  <div class="panel panel-default panel-sponsor">
 	    <div class="panel-body">