Add Notice file to complete the Apache-2.0 requirements

[Shnitzelil]

Hi,

Our legal department require us to point to Notice file in this repository.
Could you please add simple one.

Best Regards

[jhump]

The NOTICE file is only required for ASF projects (e.g. those that are governed by Apache Software Foundation, for which ASF is the copyright holder). For non-ASF projects, it is only useful if parts of the codebase use a different license or have a different copyright holder.

https://www.apache.org/foundation/license-faq.html#Apply-My-Software
https://www.apache.org/licenses/LICENSE-2.0.html#redistribution

[jhump]

Never heard back, @Shnitzelil. From all of the docs I've read, there is no requirement for a notice file here.