Add Bibstro Google Docs bibliography sample

Author: bcat

bibstro/README.markdown

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+Bibstro is a sample bibliography app for [Google Docs][docs] built upon the
+[Google Apps Script][apps_script] platform. Bibstro shows how you can extend
+Google Docs by adding custom menus, dialogs, and sidebars. Manipulating the
+active document to add a live-updating list of sources according to the
+citation format selected by the user, Bibstro enhances Google Docs by adding a
+custom implementation of a feature not natively supported.
+
+To get acquainted with Bibstro, make a copy of [this document][sample_doc] and
+experiment with the custom bibliography features exposed via the “Bibstro”
+menu. You can also view and edit Bibstro’s source code via the “Tools > Script
+editor” menu item.
+
+![][screenshot]
+
+For an overview of the Google Docs integration we used to build Bibstro, please
+see our Google I/O 2013 talk “[Extend Google Docs with Apps Script][io_video]”.
+You may also wish to consult our [guide to extending Docs][quickstart], as well
+as Apps Script's [API reference][api_reference].
+
+[api_reference]: https://developers.google.com/apps-script/reference/document/
+[apps_script]: https://developers.google.com/apps-script/
+[docs]: https://support.google.com/drive/answer/143206?ref_topic=21008&rd=1
+[io_video]: https://www.youtube.com/watch?v=KIiCSdRCqXc
+[quickstart]: https://developers.google.com/apps-script/guides/docs
+[sample_doc]: https://docs.google.com/document/d/1akzFJ9_5pABrk4NFxLDZX7DymObYfIfGZ3CTZ2CgHSY/edit
+[screenshot]: https://googledrive.com/host/0B86sei6ZHtsdVF9iaFd5cTdiNVk/bibstro-readme-screenshot.png