New example added for redispatch of Germany

[paragpatil39]

new file: examples/inputs/example_04a/buses.csv new file: examples/inputs/example_04a/config.yaml new file: examples/inputs/example_04a/demand_df.csv new file: examples/inputs/example_04a/demand_df.csv.license new file: examples/inputs/example_04a/demand_units.csv new file: examples/inputs/example_04a/demand_units.csv.license new file: examples/inputs/example_04a/fuel_prices_df.csv new file: examples/inputs/example_04a/fuel_prices_df.csv.license new file: examples/inputs/example_04a/powerplant_units.csv new file: examples/inputs/example_04a/powerplant_units.csv.license