Add Dockerfile

Closes #7 (closed)

Dockerfile

+FROM python:3-slim
+
+WORKDIR /usr/src/app
+
+COPY README.md requirements.txt pyproject.toml ./
+ADD tsg ./tsg
+ADD data ./data
+
+RUN pip install .
+
+CMD [ "transcript-generator", "--transcripts", "data/transcripts_short.csv", "--annotation", "data/Homo_sapiens.GRCh38.103.chr.gtf", "--prob_inclusion", "0.05" ]
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