C# Create a program that responds to a traffic light

Instructions:

Ask the user to input the current traffic light color $($red$,$ yellow, green$).$

Use a decision statement to print the following actions:

If the color is red, print "Stop".

If the color is yellow, print "Slow down".

If the color is green, print $"$Go$".$

If the user enters an invalid color, print "Invalid input $-$ slow down."

Make the program case$-$insensitive, so it handles "RED", "red", "Red" equally.