How to run an external script in mocha.js?

@aubrey 

To run an external script in Mocha.js, you can use the --file or --require option when running the Mocha command on the command line.

For example, if you have an external script file called external-script.js, you can run it using:

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mocha --file external-script.js

Alternatively, you can use the --require option to load the external script before running your test suite:

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mocha --require external-script.js

This will ensure that the external script is loaded and executed before running your test suite with Mocha.