Write a C++ program that takes Two numbers from the user as Start and End
Variables, then sum the numbers (from Start Value to the End value) to find their Average
Value. However, you must check if the start value is less than the end value to avoid any
logical errors that can be done by the user. If True, Display the Average Value on the screen
to the user. If False, then Display an error message to the user. (Use For loop)..