#47 Create a README.md for the ELUC use case

Author: ofrancon

README_ELUC.md

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+# Emissions from Land Use Change (ELUC)
+
+Goal: provide decision makers with tools to know how their land-use choices affect CO2 fluxes in the long-term.  
+
+The tools should help decisions makers with their choices:
+- For a geographical grid cell, identified by its latitude and longitude, what changes to the land usage can be
+made to reduce CO2 emissions?
+- What will be the long term CO2 impact of changing the land usage in a particular way?
+
+## Data
+
+### ELUC
+
+BLUE simulations with committed emissions could be used to estimate the long-term CO2 impact.
+Committed emissions: all the emissions that are caused by a land-use change event are attributed to the year of the event
+BLUE (bookkeeping of land use emissions) is a bookkeeping model that attributes carbon fluxes to land use activities.
+See [(BLUE: Bookkeeping of land use emissions)](https://doi.org/10.1002/2014GB004997) for more details.  
+
+The team in charge of the BLUE model performed such simulations with BLUE and generated the file
+`BLUE_LUH2-GCB2022_ELUC-committed_gridded_net_1850-2021.nc` available in
+[this shared folder](https://syncandshare.lrz.de/getlink/fiAuJz5VFgsEJ1E96mthCT/Data_GCB2022).
+
+### LUC
+
+The Land Use Change (LUC) data provided by the LUH2 project [(LUH2: Land Use Harmonization 2)](https://luh.umd.edu/)
+
+## Modeling
+
+### Context
+
+The context is the current usage of the land
+
+### Actions
+
+### Outcomes
+
+1. Emissions from Land Use Change (ELUC): CO2 emissions, in metric ton of carbon per hectare (tC/ha),
+resulting from the land use change
+2. Percentage of land that was changed
+
+## References
+
+ELUC data provided by the BLUE model [(BLUE: Bookkeeping of land use emissions)](https://doi.org/10.1002/2014GB004997)
+Land use change data provided by the LUH2 project [(LUH2: Land Use Harmonization 2)](https://luh.umd.edu/)
+Setup is described in Appendix C2.1 of the GCB 2022 report [(Global Carbon Budget 2022 report)](https://essd.copernicus.org/articles/14/4811/2022/#section10/)
+The Global Carbon Budget report assesses the global CO2 budget for the Intergovernmental Panel on Climate Change [(IPCC)](https://www.ipcc.ch/)