contributing: Add CONTRIBUTING.md file
contributing: Add CONTRIBUTING.md file

[ci skip]

Signed-off-by: BJ Hargrave <3d26bb3930946e3370762d769a073cece444c2d8@bjhargrave.com>

njbartlett/bnd.manual,njbartlett/bnd.manual,bndtools/bnd.manual,rotty3000/bnd.manual,bndtools/bnd.manual,rotty3000/bnd.manual,bndtools/bnd.manual,rotty3000/bnd.manual,njbartlett/bnd.manual