add initial square curriculum

[challenge-bot] / curriculum / makefile

square.png: square.scad makefile
	@openscad \
	  --render \
	  -o square.png \
          --camera=0.80,0.88,0.01,0,0,0,9.05 \
	  square.scad

square.html: square.scm square.png makefile
	@skribilo square.scm > square.html

clean:
	@rm -f square.png square.html