chore: 🤖 add license and other files before going opensource (#571)
* chore: 🤖 add license and other files before goin opensource
* chore: 🤖 add license to the python packages
* chore: 🤖 add a license + copyright header to the source code
Follow SPDX single line license convention for source files
See https://spdx.dev/ids/
See also: https://developer.blender.org/T95597
* docs: ✏️ remove token from the README