Implement JavaScript BinarySearch

[masoudnemati]

I have read the contributing guidelines in CONTRIBUTING.md and have ensured the following:

• [x] My code is placed in the required directory as outlined in CONTRIBUTING.md
• [x] My code file is named according to CONTRIBUTING.md
• [x] Variables, classes, functions etc. follow camel case as outlined in CONTRIBUTING.md
• [x] My code hasn't been implemented or claimed by someone else and I have checked the present issues and PRs for the same
• [x] My code is well commented
• [x] I have not copied my code from anywhere

[codelixir]

Looks good, merging!