Testing branch -This request applies to issue #4- Add testing with jest

[Dagogo-Clinton-Uranta]

I have added the jest library, along with babel files for appropriate compiling.
I wrote tests in Jest, mainly for the "writeSQL" function, as the "readCSV" function ultimately calls upon it.
I hope that this can be a useful starting point for other jest tests to be included :) .

[socket-security]

New and removed dependencies detected. Learn more about Socket for GitHub ↗︎

Package	New capabilities	Transitives	Size	Publisher
npm/@babel/preset-env@7.23.8	environment Transitive: filesystem, shell, unsafe	+162	14.9 MB	nicolo-ribaudo
npm/@types/jest@29.5.11	Transitive: environment, filesystem, unsafe	+50	5.67 MB	types
npm/babel-jest@29.7.0	environment Transitive: eval, filesystem, network, shell, unsafe	+149	17.6 MB	simenb
npm/jest@29.7.0	Transitive: environment, eval, filesystem, network, shell, unsafe	+290	56.5 MB	simenb
npm/ts-jest@29.1.1	environment, filesystem, unsafe Transitive: eval, network, shell	+293	56.9 MB	kul
npm/ts-node@10.9.2	environment, filesystem, unsafe	+19	38.1 MB	blakeembrey

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