docs: add Expanded Examples section with hard_wait_before_wait.py (fi…

[Hasan-8326]

This PR adds a new example file, examples/hard_wait_before_wait.py, demonstrating how to use the pre_pause_in_wait decorator to introduce a fixed hard wait before each waiting action in Selene. It also updates the README.md by adding an “Expanded Examples” section that references this new example. This contribution helps developers understand how to apply deliberate pauses for debugging or demo purposes, addressing issue #447 .