Licence for Dilithium and Kyber

[vincentvbh]

As titled.
At the beginning of each file, you will find the license information.

Manually checked properties

• Generated Github workflow (run .github/workflows/generate_workflows.py) (new schemes)
• No stringification macros
• Output-parameter pointers in functions are on the left
• Negative return values on failure of API functions (within restrictions of FO transform).
• variable declarations at the beginning (except in for (size_t i=...)
• Optional:
  • All integer types are of fixed size, using stdint.h types (including uint8_t instead of unsigned char)
  • Integers used for indexing are of size size_t

[mkannwischer]

Can we merge this or do we need to change it somehow? I would not know how to do it any better.