Add a few paragraphs to B-tree README explaining L&Y algorithm.

Heikki Linnakangas <heikki.linnakangas@iki.fi>

Commit: 49b86fb1c97878ea2e3a8118df072c95f60077ac
Author: Heikki Linnakangas <heikki.linnakangas@iki.fi>
Date: 2014-11-24T11:43:33Z
Releases: 9.5.0
Add a few paragraphs to B-tree README explaining L&Y algorithm.

This gives an overview of what Lehman & Yao's paper is all about, so that
you can understand the rest of the README without having to read the paper.

Per discussion with Peter Geoghegan and others.

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src/backend/access/nbtree/README modified +19 −2