Adds delay functionality in script_runner

[mhamidjamil]

[mhamidjamil]

In command.txt file a user can add delay before each line, example:
Before
/home/orangepi/Desktop/projects/simplefolio:npm start
After
[20s]/home/orangepi/Desktop/projects/simplefolio:npm start

Please let me know if you have any other better suggestion to add delay