Add 'Range Sum Query - Immutable'

[priyalHedau15]

https://leetcode.com/problems/range-sum-query-immutable/

[dexterpuru]

@priyalHedau15 go ahead!!

[dexterpuru]

@priyalHedau15 are you still committed to this issue or should i close it.

[priyalHedau15]

Kindly close this issue.

[YourAKShaw]

No need to close. We'll see if anyone else is interested. 😺