Add container setup

Dockerfile

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+FROM ubuntu:18.04
+
+ENV LC_ALL=C.UTF-8 LANG=C.UTF-8
+
+RUN apt-get update && \
+    apt-get install -y \
+      git \
+      libleptonica-dev \
+      libtesseract-dev \
+      libxml2-utils \
+      python3-pip \
+      tesseract-ocr-all \
+      xmlstarlet \
+    && \
+    apt-get clean
+
+COPY requirements.txt /tmp
+RUN pip3 install --no-cache-dir -r /tmp/requirements.txt
+
+COPY my_ocrd_workflow /usr/bin
+COPY xsd              /usr/bin/xsd
+
+
+WORKDIR /data
+CMD ["/usr/bin/my_ocrd_workflow"]