Go Mod support added

Merge pull request #9 from blackrez/patch-1

feat: add riscv64 stubs file

Added support for other architectures

This is done by coalescing the stubs into single files - each for an architecture. This makes it easier to update in the future.

v1.0.0

v1.0.0 - the API matches up with the Go standard library API, however, not all the functions have the float32 equivalent. The majority of functions are float32 wrappers over the math package functions. Changes to these functions will result in a change in minor number as there probably won't be much major API changes foreseeable