Initial commit of metadata submission script

.gitignore

metadata/ega_metadata.py

metadata/requirements.txt

metadata/templates/analysis.xml

metadata/templates/dac.xml

metadata/templates/dataset.xml

metadata/templates/experiment.xml

metadata/templates/policy.xml

metadata/templates/run.xml

metadata/templates/sample.xml

metadata/templates/study.xml

metadata/templates/submission.xml

metadata/tests/abstract.txt

metadata/tests/ega_upload.yaml

metadata/tests/expected/dac.xml

metadata/tests/expected/dataset.xml

metadata/tests/expected/experiment-1.xml

metadata/tests/expected/experiment-2.xml

metadata/tests/expected/experiment-3.xml

metadata/tests/expected/policy.xml