Add script usage and more information to script description being printed in help option.
- Why I did it
Missing information in script description in help option.
- How I did it
Expand script description and add script usage.
- How to verify it
Run the script with -h option.
Why I did it
Update ECMP calculator README file with new instructions how to run the calculator.
How I did it
Update README file.
How to verify it
Read README file.
- Why I did it
Added ECMP calculator tool.
- How I did it
New files were added.
- How to verify it
Manual tests performed according to tests chapter in HLD
Automated tests will be added by verification.
