add Dockerfile for RWTHJupyter

Dockerfile

+# Specify parent image. Please select a fixed tag here.
+ARG BASE_IMAGE=registry.git.rwth-aachen.de/jupyter/profiles/rwth-courses:latest
+FROM ${BASE_IMAGE}
+
+# Install packages via requirements.txt
+ADD requirements.txt .
+RUN pip install -r requirements.txt
+
+# .. Or update conda base environment to match specifications in environment.yml
+#ADD environment.yml /tmp/environment.yml
+
+# All packages specified in environment.yml are installed in the base environment
+#RUN conda env update -f /tmp/environment.yml && \
+#    conda clean -a -f -y
+