Give feedback if script run is successful

## Current Behaviour
Nothing prints to console when script is running. And when running in headless mode there is no feedback.

## Changes requested
- Add print statement on launch of script to show script is running e.g. "Getting jobs..."

Detect if script ran successfully if the following are met:
- If the "job_search.txt" file did not exist before running the script and it is created when driver closes, add print statement saying job export is successful. Otherwise print failure message.
- If the "job_search.txt" file existed before running the script. When the driver closes check if the file was updated. If so add print statement saying job export is successful. Otherwise print failure message.