Add graph

Dependencies.md

+'''mermaid
+stateDiagram-v2
+    [*] --> leximpact_prepare_data
+    leximpact_prepare_data --> leximpact_survey_scenario
+    leximpact_prepare_data --> leximpact_common_python_libraries
+    leximpact_survey_scenario --> openfisca_france_data
+    openfisca_france_data --> openfisca_france :master
+    leximpact_survey_scenario --> openfisca_france_reforms
+    openfisca_france_reforms --> openfisca_france :wip-leximpact
+'''
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