Initial version of the model

The core model structure is filled with proposed data and provides calibrated results. At the end of step 1, proposals are made regarding the interface with the additional modules and the geographic segmentation. Following the end of step 1, there is a strong emphasis on documentation: the model will include documentation next to each model assumption and calculation in the model. The model will include descriptions of the values of each lever and their rationale (milestone of preliminary findings on month 9).