Add function to access susi api service

[djmgit]

Add a function to this library to access the susi api service.

[mariobehling]

Inhowfar should we mix SUSI and loklak? Shouldn't we have two separate APIs?

[mariobehling]

What is the use case?

[djmgit]

@mariobehling Actually I was going through the python api, I found that it contains function to access susi api (although it has got a problem loklak/loklak_python_api#62 ). So I thought of adding a corresponding function to this library.

[mariobehling]

@djmgit If there is no specific use case the APIs do not need to be connected. Please open issues in the SUSI API Wrapper: https://github.com/fossasia/susi_api_wrapper

Currently we only have one common repository for all APIs. There is only a Python implementation anyways. SUSI and loklak are separated now. Closing this therefore.