add bench to the menu

Author: ufechner7

examples/menu.jl

@@ -3,6 +3,7 @@ using REPL.TerminalMenus
 options = ["rectangular_wing = include(\"rectangular_wing.jl\")",
            "ram_air_kite = include(\"ram_air_kite.jl\")",
            "stall_model = include(\"stall_model.jl\")",
+           "bench = include(\"bench.jl\")",
            "quit"]
 
 function example_menu()