Added bubble sort ,Insertion sort and selection sort

[BhavnaMogha]

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Please add label it as hacktoberfest , Thank you :)

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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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