Add C/C++ Implementation Of Exponential Search

Add the needful here and submit a PR, 
https://github.com/MadhavBahlMD/OOPS/tree/master/Search/Exponential_Search

Also, do add the algorithm and explanation in Corresponding README + snippet of code

# Format for README 

# Exponential Seaerch
Some Details

## Algorithm
Algorithm

## Explanation
Explanation

## C/C++ Code

```
Code Here
```


