add BSD0 LICENSE in compliance with rfcs#40

[bazaah]

Now that Archlinux has decided on PKGBUILD licensing, we should move to adopt the accepted standard.

See: archlinux/rfcs#40

Text:

Binary files, as well as any files describing changes ("patches") to the software that is being built are excluded from this license.
They are provided under the license terms of the software they describe
changes for.

Any files containing a license notice are excluded from this license. They are provided under the license terms defined in their respective notices.

Copyright 2024 Arch Linux Contributors

Permission to use, copy, modify, and/or distribute this software for
any purpose with or without fee is hereby granted.

THE SOFTWARE IS PROVIDED “AS IS” AND THE AUTHOR DISCLAIMS ALL
WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES
OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE
FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY
DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.