Added Wait() (#16)

Added Wait()
This function waits till all the jobs complete but doesn't cleanup
the associated resources.

Added a wait flag in Stop(wait bool) (#15)

* Added a wait flag in Stop(wait bool)
Stop(true) blocks until all the output channels are read from
* Enhanced examples
* start just 1 worker by default to conform to the user input for max workers in case they provide 1

removed apache 2 license headers

made it faster

1.3 (#13)

* Added a test to verify that even with 2 instances of goworkers, jobs and their output do not get mixed up

* more tweaks, better perf

1.2 (#11)

* Removed timeout and logs options
1. Removed timeout option
All workers will be killed if Stop() is called and if their jobs are
finished
2. Disabling logs - it is now an unexported global variable
Logging is expensive

removed an unnecessary logic

Not send nil to error channel (#9)

* SubmitCheckError should not send nil to ErrChan. (#8)

* fixed tests

Co-authored-by: devlights <gsf.zero1@devlights.onmicrosoft.com>

Update README.md

Update README.md