Created README.md for bubble sort

[abcdeepakr]

Description of Change

Checklist

• [ ] Description of change added
• [x] Added documentation
• [ ] Added examples and/or tests
• [ ] Documentation modified
• [ ] Implemented a new algorithm
• [ ] Re-implemented an existing algorithm
• [ ] Checked that PR is not a duplicate
• [ ] PR and commits are not on master branch
• [ ] Issue fix
• [ ] UI change
• [ ] Screenshot and/or link of deployment where it can be tested

Link:

[DakshKK]

Please rebase your commits, else close this PR and open a new one. Your commits are on master, so this PR is not going to be merged.