Update README.md

README.md

-== Iframed ==
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+# iframed
+
+The following code is used to combine Elphel's websites in a single tab of a browser. Those sites use different engines: drupal, wordpress, wikimedia, gitlab and mailing archive
+
+## Features
+* Any number of websites in one tab
+* Combined search
+* If enabled, inter-frame communication follows links to a site that already have a dedicated iframe
+
+## Notes
+* \<iframe\> tags are used
+* some webservers or websites (like GitLab) must include appropriate headers in the response:
+`X-frame-Options: ALLOW-FROM https://www.elphel.com/`
+* Elphel's websites have special .htaccesses configuration redirecting requests from non-'elphel' domains to the iframed website: www.elphel.com.
+* Individual website can be accessed through the name if the iframe which is a link
+
+
+## Usage
+
+* Provide a list of target websites in the $TARGET_LIST - PHP in index.php.
+* Set order, number of columns and base width - JS part in index.php.
+* (optional) To enable inter-frame links following child websites should include the following js code:
+```
+<script src="https://www.elphel.com/js/elphel_messenger.js"></script>
+<script>ElphelMessenger.init();</script>
+```
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