cyclone/docs/Developer-How-To.md

Add a primitive

• Add function/definitions to runtime.h and runtime.c
• Add to prim? section in transforms.scm. Some functions may need to added to the next section in the file, so they are not constant-folded (IE, evaluated at compile time).
• Add to the c-compile-primitive section in cgen.scm.
• TODO: compile files in what order? And copy them where? I think sld files need to be built and copied, and then cyclone and icyc need to be rebuilt linking against them?
• TODO: what about eval.scm?