New function: string concat()

[lucasfirmo62]

• [x] create the file with the proper name
• [x] create the documentation of the function
• [x] write example in examples directory
• [x] execute npm run format-examples
• [x] commit and open the PR.

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Name	Status	Preview	Comments	Updated (UTC)
some-drops-of-javascript	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Oct 30, 2023 2:41am

[roberto-butti]

Thank you @lucasfirmo62 for the great PR. I'm going to merge! Welcome as contributor!