Add Dockerfile

Dockerfile

@@ -0,0 +1,18 @@
+# Simple dockerfile for gitinspector
+# Usage:
+# To build the image, execute the following command in the repository of gitinspector. 
+# docker build -t gitinspector . 
+#
+# Run the following commands in the repository you want to analyze:
+# docker run --rm -it -v $(pwd):/repo gitinspector -f cs,fs -m -r -T -w /repo -F json > myresults.json
+# docker run --rm -it gitinspector --help 
+
+
+FROM python:3.7-alpine
+
+WORKDIR /app
+COPY . .
+
+RUN apk update && apk add git
+
+ENTRYPOINT ["python3", "/app/gitinspector.py"]