Update README with usage instructions and benefits

Added detailed usage instructions and benefits for the Field Progress Bar Counter script.

Author: poojithavalli22

Client-Side Components/Client Scripts/Field Progress Bar Counter/README.md

@@ -63,4 +63,4 @@ function onChange(control, oldValue, newValue, isLoading) {
 ## Compatibility
 - Works in all modern browsers
 - Compatible with both classic and next-experience UIs
-- Responsive design adapts to field width
+- Responsive design adapts to field width