ecological_assessment: adds first version of documentation

ecological_assessment/doc/Doxyfile

ecological_assessment/doc/DoxygenLayout.xml

ecological_assessment/doc/UML/class_diagram.puml

ecological_assessment/doc/content/additional.md

ecological_assessment/doc/content/aqi_schaefer.md

ecological_assessment/doc/content/changelog.md

ecological_assessment/doc/content/climate_model_dallara.md

ecological_assessment/doc/content/getting-started.md

ecological_assessment/doc/content/index.md

ecological_assessment/doc/content/lca_schaefer.md

ecological_assessment/doc/content/mission_emissions.md

ecological_assessment/doc/content/softwarearchitecture.md

ecological_assessment/doc/content/submodules.md

ecological_assessment/doc/content/tutorial.md

...gical_assessment/doc/content/tutorial_method_extension.md

...cal_assessment/doc/content/tutorial_strategy_extension.md

ecological_assessment/doc/header.html

ecological_assessment/doc/img/class_diagram.png

ecological_assessment/doc/img/deck_example_thrust.svg

ecological_assessment/doc/img/different_engines.svg