add cross-links between READMEs and demo
MODIFY
README.md
README.md
@@ -7,7 +7,8 @@ to each realm. It runs atop an ES6-compliant platform, enabling safe
interaction of mutually-suspicious code, using object-capabilities.
See https://github.com/Agoric/TinySES to see how SES fits into the various
-flavors of confined EcmaScript execution.
+flavors of confined EcmaScript execution. And visit
+https://rawgit.com/Agoric/SES/master/demo/ for a demo.
Build a Secure EcmaScript (SES) environment

ADD
demo/README.md
+# SES Demo
+
+This directory contains a brief online demonstration of how SES enables safe
+interaction between mutually suspicious code. Visit
+https://rawgit.com/Agoric/SES/master/demo/ to run it.
+
+For local testing, run a web server and serve the entire git tree (the demo
+accesses the generated `ROOT/dist/ses-shim.js` file, so serving just this
+`demo/` directory is not enough). Re-run `npm run-script build` after any
+changes to the source code to rebuild `ses-shim.js`.

MODIFY
demo/index.html
demo/index.html
@@ -85,6 +85,7 @@ setGuess('0000000000');
<li><button id="sample-timing" type="button">Timing Side-Channel</button></li>
</ul>
+<p>(<a href="https://github.com/Agoric/SES/tree/master/demo">demo source code</a>)</p>
<script src="demo-start.js" type="text/javascript" charset="utf-8"></script>
</body>

add cross-links between READMEs and demo