Add README.org.

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+* prepare the environment
+
+#+BEGIN_SRC sh
+guix environment -l guix.scm
+#+END_SRC
+
+* build things
+
+To render WAV files for all the songs:
+
+#+BEGIN_SRC sh
+make
+#+END_SRC
+
+To build the bass part for just “Circus”:
+
+#+BEGIN_SRC sh
+make 03-circus/parts/bass.pdf
+#+END_SRC
+
+To build a drum guide track with click:
+
+#+BEGIN_SRC sh
+make guide
+#+END_SRC