add script that creates singularity image for UWLCM with GPU support

singularity/README_singularity.md

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+Use Singularity: https://sylabs.io/singularity/ to create image for UWLCM
+
+Build the image remotely here: https://cloud.sylabs.io/builder
+
+```bash
+$ singularity build --remote sng_ubuntu_18_04_cuda_10_0.sif sng_ubuntu_18_04_cuda_10_0
+```
+
+The image works with CUDA Driver Version: 410.79 and CUDA Version: 10.0
+
+To run the image with GPU support use --nv flag:
+```bash
+$ singularity shell --nv sng_ubuntu_18_04_cuda_10_0.sif
+```
+
+Follow the libmpdata and libcloud readme on how to compile them and run tests.
+
+Install both libraries in a local_folder:
+```bash
+$ cmake -DCMAKE_INSTALL_PREFIX=/local_folder/
+$ make install
+```
+
+When compiling UWLCM tell cmake where to find the two locally installed libraries:
+```bash
+$ cmake .. -Dlibmpdata++_DIR=/local_folder/usr/local/share/libmpdata++ -Dlibcloudph++_DIR=/local_folder/usr/local/lib/cmake/libcloudph++
+$ make
+```
+
+Prepare to wait as UWLCM and libcloudph++ take long time to compile.
+After that youre done.

singularity/sng_ubuntu_18_04_cuda_10_0

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+Bootstrap: docker
+From: nvidia/cuda:10.0-devel-ubuntu18.04
+
+%post
+export DEBIAN_FRONTEND=noninteractive
+export  TZ=America/Los_Angeles
+ln -snf /usr/share/zoneinfo/$TZ /etc/localtime && echo $TZ > /etc/timezone
+
+apt-get update -qq \
+    && apt-get install -yq --no-install-recommends \
+        sudo \
+        apt-utils \
+        build-essential \
+        pkg-config \
+        git \
+        cmake \
+        ca-certificates \
+        software-properties-common \
+        vim \
+        curl \
+        language-pack-en-base
+
+add-apt-repository ppa:ubuntu-toolchain-r/test
+apt-get update
+
+add-apt-repository ppa:ubuntu-toolchain-r/test
+apt-get update -qq \
+    && apt-get install -yq --no-install-recommends \
+        wget \
+        gnuplot-nox \
+        libgnuplot-iostream-dev \
+        libhdf5-dev \
+        hdf5-tools \
+        python-dev \
+        python-h5py \
+        python-numpy \
+        python-scipy \
+        python-matplotlib \
+        python-pytest \
+        libthrust-dev \
+        libboost-all-dev
+
+git clone --depth=1 git://github.com/thrust/thrust.git
+sudo ln -s `pwd`/thrust/thrust /usr/local/include/thrust
+
+git clone --depth=1 git://github.com/blitzpp/blitz.git
+cd blitz
+mkdir build
+cd build
+cmake .. -DCMAKE_INSTALL_PREFIX=/usr
+make
+sudo make install
+cd ../../