Docs: add DAZN credits in docs

[saragerion]

Description of the feature request

Add DAZN credits to README

Problem statement

Summary of the feature

Code examples

https://github.com/awslabs/aws-lambda-powertools-python/

Benefits for you and the wider AWS community

Acknowledgement of importance of DAZN Lambda Powertools library which paved the road and inspired this AWS library:
https://github.com/getndazn/dazn-lambda-powertools

Describe alternatives you've considered

Additional context

Related issues, RFCs

[github-actions]

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