Add README

README.md

+# Odissee Docker
+
+Docker container recipe to run ska-sdp-low-selfcal (https://gitlab.com/ska-telescope/sdp/science-pipeline-workflows/ska-sdp-wflow-selfcal)
+
+
+# Building
+
+To build the image execute:
+
+```
+    docker build -t [tagname] .
+```
+
+*Note*: the code is installed and compiled for the specific architecture of the machine that built the docker image. Therefore it might not run on different architectures. 
+
+# Executing the pipeline 
+
+Start the docker container with the command
+
+```
+docker --rm -it -u $UID:$GID [tagname] [-v /data/volume:/data/volume] /bin/bash
+
+# within the interactive shell in the container
+source /spack/share/spack/setup-env.sh &&\
+       spack env activate base
+
+export EVERYBEAM_DATADIR=$(find /spack/opt/spack -name "everybeam-0.7.0*")/share/everybeam
+```
+
+And finally to run the pipeline use the following command:
+
+```
+export DP3=$(which DP3)
+export WSCLEAN=$(which wsclean)
+
+
+python /ska-sdp-wflow-selfcal/src/ska_sdp_wflow_selfcal/pipeline/main.py \
+        --dp3_path $DP3  \
+        --wsclean_cmd $WSCLEAN \
+        --restore_args "-j 14" \
+        --input_ms [path_to_input_ms] \
+        --work_dir $PWD \
+        --config /ska-sdp-wflow-selfcal/config/LOFAR.averaged.yml \
+        --run_single_operation False \
+        --ignore_version_errors True 
+```
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