docs add data for case study

src/energy_available_and_user_demand_data.txt

+6:00 5000 200
+7:00 2000 600
+8:00 1500 700
+9:00 2000 600
+10:00 5000 300
+11:00 5000 300
+12:00 5000 300
+13:00 5000 300
+14:00 5000 300
+15:00 5000 300
+16:00 5000 300
+17:00 5000 300
+18:00 5000 300
+19:00 5000 300
+20:00 4000 200
+21:00 3000 150
+22:00 2000 100
\ No newline at end of file