Add README.md

README.md

+# ATTINY44a_blink
+
+This repo contains a variety of "hello world" type programs for an ATTINY44a
+connected to an LED and a button. Not coincidentally this is the sort of board I
+ended up with after modifying Neil's
+[echo](http://academy.cba.mit.edu/classes/embedded_programming/index.html#echo)
+board based on the guidelines of the
+[electronics design](http://academy.cba.mit.edu/classes/electronics_design/index.html)
+assignment.