add c# assembly for fsmn vad (#650)

manyeyes

2023-06-21 c2a2575f198b1bfd452ea5769bec81bcce3d3a42

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add_library(csrc STATIC
        feature-fbank.cc
        feature-functions.cc
        feature-window.cc
        fftsg.c
        mel-computations.cc
        online-feature.cc
        rfft.cc)