Program included: Interactive introductions to VECTORS

[resel143]

Hi, I have included interactive introductions to the vectors file in CPP

please review and merge

please add Hakctoberfest accepted

Thanks in advance!!

[welcome[bot]]

Thanks for opening this pull request! 🤗 Your PR will be reviewed and merged soon !! In the mean time don't forget to give a star to this repo !! Wishing you a great Hacktoberfest 2021 🙌 🎉 ⚡️

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