added leetcode problem:delete given node

[ms1901]

Hey there!, Thanks for submitting a PR to this repo :smiley:
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• [x] My Pull Request adheres to the Contribution guidelines.
• [x] I have added problem.md and solution files in the appropriate folder.
• [x] In problem.md I have provided a correct link to the problem.
  (In case you are not adding a problem, you can freely mark this as complete)
• [x] The solution I have given is my own and not plagiarized in any form.
• [x] My solution passes all the testcases within the given constraints.
• [x] I have properly indented and documented my solution using comments.
• [x] I agree that all the above marked are true to the best of my knowledge and my PR can be closed if found otherwise.

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[mergify[bot]]

Awesome :thumbsup:, Thanks for contributing :smiley:!

[Vishruth-S]

Do star ⭐ this repo please 🙃