adding back files to be reviewed

Dockerfile

@@ -0,0 +1,38 @@
+FROM ubuntu:latest
+
+# Setup environment variables for Docker image
+ENV FC=/usr/bin/mpif90 CC=/usr/bin/mpicc CXX=/usr/bin/mpicxx \
+    PATH=/opt/openmc/bin:/opt/NJOY2016/build:$PATH \
+    LD_LIBRARY_PATH=/opt/openmc/lib:$LD_LIBRARY_PATH \
+    OPENMC_CROSS_SECTIONS=/root/nndc_hdf5/cross_sections.xml \
+    OPENMC_ENDF_DATA=/root/endf-b-vii.1
+
+# Install dependencies from Debian package manager
+RUN apt-get update -y && \
+    apt-get upgrade -y && \
+    apt-get install -y python3-pip && \
+    apt-get install -y wget git emacs && \
+    apt-get install -y gfortran g++ cmake && \
+    apt-get install -y mpich libmpich-dev && \
+    apt-get install -y libhdf5-serial-dev libhdf5-mpich-dev && \
+    apt-get install -y imagemagick && \
+    apt-get autoremove
+
+# Update system-provided pip
+RUN pip3 install --upgrade pip
+
+# Clone and install NJOY2016
+RUN git clone https://github.com/njoy/NJOY2016 /opt/NJOY2016 && \
+    cd /opt/NJOY2016 && \
+    mkdir build && cd build && \
+    cmake -Dstatic=on .. && make 2>/dev/null && make install
+
+# Clone and install OpenMC
+RUN git clone https://github.com/openmc-dev/openmc.git /opt/openmc && \
+    cd /opt/openmc && mkdir -p build && cd build && \
+    cmake  -Doptimize=on -DHDF5_PREFER_PARALLEL=on .. && \
+    make && make install && \
+    cd .. && pip install -e .[test]
+
+# Download cross sections (NNDC and WMP) and ENDF data needed by test suite
+RUN ./opt/openmc/tools/ci/download-xs.sh