Added Bankers Algorithm Problem

[mansadixit]

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I have added Banker's Algorithm Problem in C++. Kindly consider the pull request.

[MilindGupta-Creator]

What is banker's algorithm??

[MilindGupta-Creator]

Who will mention and what you are doing in the code

[mansadixit]

Banker's Algorithm is a part of Operating Systems used to remove deadlocks. It is often used case in the form of Job Sequencing. I'll add comments in the code to make it clearer.