Create BinarySearch.cpp

[akshikamudgal]

What is the change?

Added the binary search documentation

Related issue?

closes: #31

Checklist:

Before you create this PR, confirm all the requirements listed below by checking the checkboxes [x]:

• I have followed the Code of Conduct.
• I have checked there aren't other open Pull Requests for the same update/change.
• I have you tested the code before submission.
• I have commented my code, particularly in hard-to-understand areas.
• My changes generates no new warnings.
• I'm Hacktoberfest'21 contributor.

[siddhi-244]

this is a documentation repository so make sure you submit files with .md extension

[akshikamudgal]

this is a documentation repository so make sure you submit files with .md extension

Yes, I have done the required changes.

[siddhi-244]

It's plagiarized. Write in your own words.

[akshikamudgal]

It's plagiarized. Write in your own words.

Done

[siddhi-244]

It's already there. Please try to improve that doc !

[akshikamudgal]

It's already there. Please try to improve that doc !

Everything else is present but the code provided is in python and java, so I have to add C++ ?

[siddhi-244]

It's already there. Please try to improve that doc !

Everything else is present but the code provided is in python and java, so I have to add C++ ?

Yaa you can !

[akshikamudgal]

It's already there. Please try to improve that doc !

Everything else is present but the code provided is in python and java, so I have to add C++ ?

Yaa you can !

Updated both #31 and #74 but it is taking both commits together, if it should be done separately suggest me the solution.