Added citation file

[Filos1992]

Description

[github-actions]

Name	Stmts	Miss	Cover	Missing
paint/__init__.py	4	0	100%
paint/data/__init__.py	15	0	100%
paint/data/binary_extractor.py	62	2	97%	78-85
paint/data/calibration_stac.py	10	0	100%
paint/data/catalog_stac.py	4	0	100%
paint/data/deflectometry_stac.py	10	0	100%
paint/data/dwd_mappings.py	2	0	100%
paint/data/dwd_stac_item.py	5	0	100%
paint/data/dwd_weather.py	44	1	98%	100
paint/data/heliostat_catalog_stac.py	4	0	100%
paint/data/juelich_weather_converter.py	51	3	94%	59, 111-114
paint/data/juelich_weather_mappings.py	20	0	100%
paint/data/juelich_weather_stac_item.py	6	0	100%
paint/data/properties_stac.py	11	0	100%
paint/data/target_cropper.py	55	1	98%	206
paint/data/tower_measurements.py	46	0	100%
paint/data/tower_stac.py	5	0	100%
paint/data/weather_collection_stac.py	5	0	100%
paint/util/__init__.py	5	0	100%
paint/util/gauss_kruger_converter.py	69	2	97%	57, 143
paint/util/paint_mappings.py	222	0	100%
paint/util/preprocessing.py	31	0	100%
paint/util/renovation_mappings.py	2	2	0%	1-3
paint/util/utils.py	60	2	97%	109-110
TOTAL	748	13	98%