Create 523_ContinuousSubarraySum.cpp

[tanyagupta0201]

code is unformatted. Also, give space between // and first word.

[tanyagupta0201]

Didn't give space between // and first word ?

[coderaastha]

there is already space between // and first word

[tanyagupta0201]

there is already space between // and first word

I am talking about the comments in code not only the date and name one.