added binarysearch.java

[SurajPratap10]

Fixes #

Short description of what this resolves:

What Changes proposed in this pull request:

Checklist

• [ ] Added description of change
• [ ] Added file name matches File name guidelines
• [x] Added code examples, test must pass
• [ ] Added documentation so that the program is self-explanatory and educational.
• [ ] Relevant documentation/comments is changed or added
• [ ] PR title follows semantic commit guidelines
• [ ] Search previous suggestions before making a new one, as yours may be a duplicate.
• [x] I acknowledge that all my contributions will be made under the project's license.

Notes: