README.md: add link to home page

README.md

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 # ![BASIC Engine logo](./doc/basic_engine_small.png) BASIC Engine Firmware (ALPHA!)
 
-The BASIC Engine is a very low-cost single-board home computer with advanced
+The [BASIC Engine](https://basicengine.org/) is a very low-cost single-board home computer with advanced
 2D color graphics and sound capabilities, roughly comparable to late-1980s
 or early-1990s computers and video game consoles.  It can be built at home
 without special skills or tools and using readily available components for