[meta] Add topics to the repository

[micalevisk]

to make this repository searchable from https://github.com/topics/nestjs and https://github.com/topics/nestjs-lib and https://github.com/topics/nest pages, you just need to add these three topics: nestjs & nestjs-lib & nest :smile_cat: (and the aws would be good too I guess)

[micalevisk]

Also, you can add the docs site https://labo8.github.io/nestjs-s3 as the website of the repository so people could find it easily :fire:

[MartinAndreev]

Thank you for the suggestion. We will add them.

[MartinAndreev]

Done :)