sandbox: update READMEs for projects

README.rst

@@ -7,9 +7,11 @@ topics.
 Projects
 --------
 
++ ``blue-pill/``: blue pill experiments
 + ``lpn/``: `Learn Prolog Now <http://lpn.swi-prolog.org/>`_
 + ``misc/``: A scratchpad of random programs; a replacement for
-  `the basement <https://github.com/kisom/the_basement>`_.
+  `the basement <https://github.com/kisom/the_basement>`_
 + ``ods/``: `Open Data Structures <http://opendatastructures.org>`_
 + ``par/``: `A Pamphlet Against R <https://panicz.github.io/pamphlet/>`_
++ ``practical_prolog/``: `The Practice of Prolog <https://mitpress.mit.edu/books/practice-prolog>`_
 + ``uc/``: `Understanding Computation <http://computationbook.com/>`_

blue-pill/README.txt

@@ -0,0 +1,13 @@
+blue-pill:
+
+A small STM32 (Cortex-M0) development board. I bought five dev boards
+and a JTAG programmer for sub-$20, and figured I'd mess around with it
+and see what happens.
+
+Projects:
+
++ blinky: the hello, world of software projects
++ draugr: a hardware abstraction layer, due to be renamed
++ skeleton: currently a skeleton for experiments, due to
+  be replaced by draugr
++ pins.txt: some useful hookup information