Implemented Interpolation Search Algorithm in Cpp

[srivathsa729]

Implemented Interpolation Search Algorithm in Cpp

Wrote code for Interpolation Search Algoorithm

Issue no.(must) - #358

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• [x] My file is in proper folder
• [x] I am following clean code and Documentation. My code is well linted and I am using flake8 standard for python
• [x] I have added title and what program will do first in the file

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