Documentation: add documentation for C sdk

[RaphaelDarley]

Description

add a page under sdks for the c library

Is there an existing issue for this?

• [X] I have searched the existing issues

Code of Conduct

• [X] I agree to follow this project's Code of Conduct

[Ekwuno]

@RaphaelDarley can you make this an internal linear ticket under documentation please.