Add Dockerfile for running the unittests

Build the docker with the command
    docker build -f test/Dockerfile -t precise-test .

test/Dockerfile

@@ -0,0 +1,10 @@
+FROM python:3.7-slim
+ENV TERM linux
+ENV DEBIAN_FRONTEND noninteractive
+RUN apt-get update && apt-get -y install git python3-scipy cython libhdf5-dev python3-h5py portaudio19-dev swig libpulse-dev libatlas-base-dev
+ADD . mycroft-precise
+WORKDIR mycroft-precise
+RUN pip install .
+RUN pip install pytest
+ENV PYTHONPATH /mycroft-precise
+ENTRYPOINT ["pytest"]