Added basic configuration and exposure model definitions

.gitignore

README.md

config_example.yml

gdeimporter/aggregatedexposuremodel.py

gdeimporter/configuration.py

gdeimporter/exposureentity.py

gdeimporter/gdeimporter.py

setup.py

tests/data/config_for_testing_good.yml

tests/data/config_for_testing_missing_01.yml

tests/data/config_for_testing_missing_02.yml

tests/data/config_for_testing_missing_03.yml

tests/data/metadata_for_testing.csv

tests/data/metadata_for_testing.xlsx

tests/data/metadata_for_testing_repeated_col.xlsx

tests/data/metadata_for_testing_repeated_field.xlsx

tests/test_aggregatedexposuremodel.py

tests/test_configuration.py