trimmomatic: add singularity files

src/singularity_modules/trimmomatic/0.36/build.sh

+#/bin/sh
+sudo singularity build --force bin/trimmomatic:0.36.sif src/singularity_modules/trimmomatic/0.36/trimmomatic.def
+singularity sign bin/trimmomatic:0.36.sif

src/singularity_modules/trimmomatic/0.36/trimmomatic.def

+Bootstrap: docker
+From: ubuntu:18.04
+
+%labels
+MAINTAINER Laurent Modolo
+
+%post
+TRIMMOMATIC_VERSION=0.36
+PACKAGES=trimmomatic=${TRIMMOMATIC_VERSION}*
+
+apt-get update && \
+apt-get install -y --no-install-recommends ${PACKAGES} && \
+apt-get clean
+
+%environment
+export TRIMMOMATIC_VERSION=0.36
+
+%runscript
+exec /bin/bash "$@"