Initial approach to a widget based plugin system

Change-Id: I8ad07c817248a0d205ec9eb66f0dc579fbcd7160
diff --git a/dev/demo/plugin-client.html b/dev/demo/plugin-client.html
new file mode 100644
index 0000000..e06b38f
--- /dev/null
+++ b/dev/demo/plugin-client.html
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+<!DOCTYPE html>
+<html>
+  <head>
+    <title>Plugin demo</title>
+    <link type="text/css" rel="stylesheet" href="/css/kalamar.css" />
+
+    <!-- load client javascript library -->
+    <script src="/js/src/plugin/client.js"></script>
+  </head>
+  <body>
+    <h2>Example Widget!</h2>
+    <a onclick="KorAPlugin.log(333, 'Huhu!')">Send log!</a>
+  </body>
+</html>