Add links to open API spec in ReDoc and Swagger Editor

[gregory1g]

Problem description
To view an API in a Swagger Editor one need to do few manual steps (every time).

Possible evolution
Add direct links to view the API specification in ReDoc and Swagger Editor in the main read.me like this is done for other APIs (for example https://github.com/camaraproject/SimSwap)

[sachinvodafone]

It appears that almost all Camera APIs follow a standard template that includes ReDoc and Swagger Editor to open specifications. Therefore, it would be beneficial to use the same approach.

[jgarciahospital]

AFAIK, only released APIs are including such schema. In any case, for simplicity while reviewing the code, I'll open a PR to include the link to the WIP yaml.

[gregory1g]

Having these links is handy independent on "released state": in the main branch - to the API version which is currently in main branch (which is mostly always a WIP), in the release branch - to the released version.

[jgarciahospital]

Agreed and solved in #19