Create SentinelSearch.php

[Abhishek-Pashte]

Added Sentinel Search algorithm in Searches algorithms

[darwinz]

Thank you for contributing. Please add this algorithm to the Directory and add unit tests. See CONTRIBUTING if you have any questions.

[Abhishek-Pashte]

Required changes has been made

[Abhishek-Pashte]

Required changes has been made. Pls review those changes

[darwinz]

Thanks for making those changes. Please fix the linting errors that came up in the code-style workflow checks.

[darwinz]

@Abhishek-Pashte , looks like we still have some linting errors

[darwinz]

Thanks!